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This Teacher Turned Her Classroom Into Harry Potter Heaven

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Trading in the lazy days of summer for hours sitting at a classroom desk can be kind of a drag, but one teacher is easing the pain with some magical craft work. Middle school teacher and avid Harry Potter fan Stephanie Stephens transformed her classroom in Oklahoma City into a wonderful wizarding world straight out of Harry Potter and the Sorcerer’s Stone

The classroom door was papered over to look like a brick wall, a nod to the book’s magical gateway to the Hogwarts Express, Platform 9¾. A bulletin board was decorated to look like the Dursley’s fireplace with Hogwarts acceptance letters flying out. Different sections of the room are divided into the different school houses, and there’s a potions station, a prefect’s table, and even a three-headed (stuffed) dog. And of course, there is a whole stock of Harry Potter novels. 

She sorted the kids in her classroom into the Hogwarts houses so that they can earn “house points” for good behavior, like in the book. Stephens is hoping her obsession with Harry Potter—she and her husband fall asleep to a different movie in the series each night—will translate to her students, and that the witchy decor will help inspire them to become passionate readers, too. 

[h/t: Good Morning America]

All images from 86thdj via Reddit.

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5 Things You Should Know About Chinua Achebe
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Often referred to as the “father of African literature,” author Chinua Achebe was born in Ogidi, Nigeria on this day in 1930. Though he passed away in 2013, Google is celebrating what would be his 87th birthday with a Google Doodle. Here are five things you should know about the award-winning writer.


Though he was always an avid reader and began learning English at the age of eight, Chinua Achebe hadn’t always planned to become a beacon of the literary world. After studying at Nigeria’s prestigious Government College (poet Christopher Okigbo was one of his classmates), Achebe earned a scholarship to study medicine at University College in lbadan. One year into the program he realized that writing was his true calling and switched majors, which meant giving up his scholarship. With financial help from his brother, Achebe was able to complete his studies.


While storytelling had long been a part of Achebe’s Igbo upbringing in Nigeria, that was only part of what inspired him to write. While in college, he read Mister Johnson, Irish writer Joyce Cary’s tragicomic novel about a young Nigerian clerk whose happy-go-lucky demeanor infects everyone around him. While TIME Magazine declared it the “best book ever written about Africa,” Achebe disagreed.

“My problem with Joyce Cary’s book was not simply his infuriating principal character, Johnson,” Achebe wrote in Home and Exile. “More importantly, there is a certain undertow of uncharitableness just below the surface on which his narrative moves and from where, at the slightest chance, a contagion of distaste, hatred, and mockery breaks through to poison his tale.” The book led Achebe to realize that “there is such a thing as absolute power over narrative,” and he was inspired to take control of it to tell a more realistic tale of his home.


Though he studied writing, Achebe wasn’t all too sure that he learned much about the art in college. In an interview with The Paris Review, he recalled how the best piece of advice he had ever gotten was from one of his professors, James Welch, who told him, “We may not be able to teach you what you need or what you want. We can only teach you what we know.”

I thought that was wonderful. That was really the best education I had. I didn’t learn anything there that I really needed, except this kind of attitude. I have had to go out on my own. The English department was a very good example of what I mean. The people there would have laughed at the idea that any of us would become a writer. That didn’t really cross their minds. I remember on one occasion a departmental prize was offered. They put up a notice—write a short story over the long vacation for the departmental prize. I’d never written a short story before, but when I got home, I thought, Well, why not. So I wrote one and submitted it. Months passed; then finally one day there was a notice on the board announcing the result. It said that no prize was awarded because no entry was up to the standard. They named me, said that my story deserved mention. Ibadan in those days was not a dance you danced with snuff in one palm. It was a dance you danced with all your body. So when Ibadan said you deserved mention, that was very high praise.

I went to the lecturer who had organized the prize and said, You said my story wasn’t really good enough but it was interesting. Now what was wrong with it? She said, Well, it’s the form. It’s the wrong form. So I said, Ah, can you tell me about this? She said, Yes, but not now. I’m going to play tennis; we’ll talk about it. Remind me later, and I’ll tell you. This went on for a whole term. Every day when I saw her, I’d say, Can we talk about form? She’d say, No, not now. We’ll talk about it later. Then at the very end she saw me and said, You know, I looked at your story again and actually there’s nothing wrong with it. So that was it! That was all I learned from the English department about writing short stories. You really have to go out on your own and do it.


Though typewriters, followed by computers, were ubiquitous, Achebe preferred a “very primitive” approach. “I write with a pen,” he told The Paris Review. “A pen on paper is the ideal way for me. I am not really very comfortable with machines; I never learned to type very well. Whenever I try to do anything on a typewriter, it’s like having this machine between me and the words; what comes out is not quite what would come out if I were scribbling. For one thing, I don’t like to see mistakes on the typewriter. I like a perfect script. On the typewriter I will sometimes leave a phrase that is not right, not what I want, simply because to change it would be a bit messy. So when I look at all this … I am a preindustrial man.”


Achebe’s status as the “father of African literature” is no joke, and it’s largely due to his debut novel, Things Fall Apart. Published in 1958, the book—which follows the life of Okonkwo, an Igbo leader and wrestling champion—has gone on to sell more than 10 million copies and has been translated into 50 different languages. Even today, nearly 60 years after its original publication, it remains one of the most taught and dissected novels about Africa.

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Used by permission of Johannes Zanker
10 Award-Winning Optical Illusions and Brain Puzzles
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"The Spinning Disks Illusion"
Used by permission of Johannes Zanker

When the new book Champions of Illusion: The Science Behind Mind-Boggling Images and Mystifying Brain Puzzles arrived at the Mental Floss offices, we couldn't flip through it—and flip our brains out—fast enough.

Created by Susana Martinez-Conde and Stephen Macknik, professors of ophthalmology, neurology, physiology, and pharmacology at SUNY Downstate Medical Center in Brooklyn, New York, the book is a fascinating compilation of award-winning images from the Best Illusion of the Year contest, which Martinez-Conde and Macknik first created for a neuroscience conference in 2005. Since then, the contest has produced some truly mind-bending mind tricks that challenge our sense of perception of the world around us. As the authors write:

Your brain creates a simulation of the world that may or may not match the real thing. The "reality" you experience is the result of your exclusive interaction with that simulation. We de­fine "illusions" as the phenomena in which your perception differs from physical reality in a way that is readily evident. You may see something that is not there, or fail to see something that is there, or see something in a way that does not reflect its physical properties.

Just as a painter creates the illusion of depth on a flat canvas, our brain creates the illusion of depth based on information arriving from our essentially two-dimensional retinas. Illusions show us that depth, color, brightness, and shape are not absolute terms but are subjective, relative experiences created actively by our brain's circuits. This is true not only of visual experiences but of any and all sensory perceptions, and even of how we ponder our emotions, thoughts, and memories. Whether we are experiencing the feeling of "redness," the appearance of "square­ness," or emotions such as love and hate, these are the result of the activity of neurons in our brain.

Yes, there is a real world out there, and you perceive events that occur around you, however incorrectly or incompletely. But you have never actually lived in the real world, in the sense that your experience never matches physical reality perfectly. Your brain instead gathers pieces of data from your sensory systems—some of which are quite imprecise or, frankly, wrong.

It's never been so fun to be wrong. Here are 10 of our favorite images from Champions of Illusion, accompanied by explanations from the book of how and why they work.


coffer illusion by Anthony Norcia, Stanford University
Used by permission of Anthony Norcia, Stanford University

Information transmitted from the retina to the brain is constrained by physical limitations, such as the number of nerve fibers in the optic nerve (about a million wires). If each of these fibers was responsible for producing a pixel (a single point in a digital image), you should have lower resolution in your everyday vision than in the images from your iPhone camera, but of course this is not what we perceive.

One way our visual system overcomes these limitations—to present us with the perception of a fully realized world, despite the fundamental truth that our retinas are low-resolution imaging devices—is by disregarding redundant features in objects and scenes. Our brains preferentially extract, emphasize, and process those unique components that are critical to identifying an object. Sharp discontinuities in the contours of an object, such as corners, are less redundant—and therefore more critical to vision—because they contain more information than straight edges or soft curves. The perceptual result is that corners are more sa­lient than non-corners.

The Coffer Illusion contains sixteen circles that are invisible at first sight, obscured by the rectilinear shapes in the pattern. The illusion may be due, at least in part, to our brain's preoccupation with corners and angles.


"The Rotating Snakes Illusion" by Akiyoshi Kitaoka
Used by permission of Akiyoshi Kitaoka

This illusion is a magnificent example of how we perceive illusory motion from a stationary image. The "snakes" in the pattern appear to rotate as you move your eyes around the figure. In reality, nothing is moving other than your eyes!

If you hold your gaze steadily on one of the "snake" centers, the motion will slow down or even stop. Our research, conducted in collaboration with Jorge Otero-Millan, revealed that the jerky eye motions—such as microsaccades, larger saccades, and even blinks—that people make when looking at an image are among the key elements that produce illusions such as Kitaoka's Rotating Snakes.

Alex Fraser and Kimerly J. Wilcox discovered this type of illusory motion effect in 1979, when they developed an image showing repetitive spiral arrangements of luminance gradients that appeared to move. Fraser and Wilcox's illusion was not nearly as effective as Kitaoka's il­lusion, but it did spawn a number of related effects that eventually led to the Rotating Snakes. This family of perceptual phenomena is characterized by the periodic placement of colored or grayscale patches of particular brightnesses.

In 2005, Bevil Conway and his colleagues showed that Kitaoka's illusory layout drives the responses of motion-sensitive neurons in the visual cortex, providing a neural basis for why most people (but not all) perceive motion in the image: We see the snakes rotate because our visual neurons respond as if the snakes were actually in motion.

Why doesn't this illusion work for everyone? In a 2009 study, Jutta Billino, Kai Ham­burger, and Karl Gegenfurtner, of the Justus Liebig University in Giessen, Germany, tested 139 subjects—old and young—with a battery of illusions involving motion, including the Rotating Snakes pattern. They found that older people perceived less illusory rotation than younger subjects.


healing grid illusion by Ryota Kanai
Used by permission of Ryota Kanai

Let your eyes explore this image freely and you will see a regular pattern of intersecting horizontal and vertical lines in the center, flanked by an irregular grid of misaligned crosses to the left and right. Choose one of the intersections in the center of the image and stare at it for 30 seconds or so. You will see that the grid "heals" itself, becoming perfectly regular all the way through.

The illusion derives, in part, from "perceptual fading," the phenomenon in which an unchanging visual image fades from view. When you stare at the center of the pattern, the grid's outer parts fade more than its center due to the comparatively lower resolution of your peripheral vision. The ensuing neural guesstimates that your brain imposes to "reconstruct" the faded outer flanks are based on the available information from the center, as well as your nervous system's intrinsic tendency to seek structure and order, even when the sensory in­put is fundamentally disorganized.

Because chaos is inherently unordered and unpredictable, the brain must use a lot of energy and resources to process truly chaotic information (like white noise on your TV screen). By simplifying and imposing order on images like this one, the brain can reduce the amount of information it must process. For example, because the brain can store the image as a rectilinear framework of white rows and columns against a black background—rather than keeping track of every single cross's position—it saves energy and mental storage space. It also simplifies your interpretation of the meaning of such an object.


mask of love by Gianni Sarcone, Courtney Smith, and Marie-Jo Waeber
Courtesy of Gianni Sarcone, Courtney Smith, and Marie-Jo Waeber. Copyright © Gianni A. Sarcone, All rights reserved.

This illusion was discovered in an old photograph of two lovers sent to Archimedes' Laboratory, a consulting group in Italy that specializes in perceptual puzzles. Gianni Sarcone, the leader of the group, saw the image pinned to the wall and, being nearsighted, thought it was a single face. After putting on his eyeglasses, he realized what he was looking at. The team then superimposed the beautiful Venetian mask over the photograph to create the final effect.

This type of illusion is called "bistable" because, as in the classic Face/Vase illusion, you may see either a single face or a couple, but not both at once. Our visual system tends to see what it expects, and because only one mask is present, we assume at first glance that it surrounds a single face.


age is all in your head illusion by Victoria Skye
Used by permission of Victoria Skye

The magician, photographer, and illusion creator Victoria Skye was having a hard time taking a picture of a photo portrait of her father as a teen. The strong overhead lighting was ruining the shot, so she tilted the camera to avoid the glare, first one way and then the other. As she moved her camera back and forth, she saw her father morph from teen to boy and then to adult.

Skye's illusion is an example of anamorphic perspective. By tilting her camera, she created two opposite vanishing points, producing the illusion of age progression and regression. In the case of age progression, the top of the head narrows and the bottom half of the face expands, creating a stronger chin and a more mature look. In the case of age regression, the opposite happens: the forehead expands and the chin narrows, producing a childlike appearance.

Skye thinks that her illusion may explain why, when we look at ourselves in the mirror, we sometimes see our parents, but not always. "I wonder if that is what happens to me when I look in the mirror and see my mom. Do I see her because I tilt my head and age myself just as I did with the camera and my dad?" she asked.


rotating tilted lines illusion by Simone Gori and Kai Hamburger
Used by permission of Simone Gori and Kai Hamburger

To experience the illusion, move your head forward and backward as you fixate in the central area (or, alternatively, hold your head still and move the page). As you approach the image, notice that the radial lines appear to rotate counterclockwise. As you move away from the image, the lines appear to rotate clockwise. Vision scientists have shown that illusory motion activates brain areas that are also activated by real motion. This could help explain why our perception of illusory motion is qualitatively similar to our perception of real motion.


Pulsating Heart illusion by Gianni Sarcone, Courtney Smith, and Marie-Jo Waeber

This Op Art–inspired illusion produces the sensation of expanding motion from a completely stationary image. Static repetitive patterns with just the right mix of contrasts trick our visual system's motion-sensitive neurons into signaling movement. Here the parallel arrangement of opposing needle-shaped red and white lines makes us perceive an ever-expanding heart. Any other outline delimited in a similar fashion would also appear to pulsate and swell.


ghostly gaze illusion by Rob Jenkins
Used by permission of Rob Jenkins

Not knowing where a person is looking makes us uneasy. That's why speaking with somebody who is wearing dark sunglasses can be awkward. And it is why someone might wear dark sunglasses to look "mysterious." The Ghostly Gaze Illusion, created by Rob Jenkins, takes advantage of this unsettling effect. In this illusion, twin sisters appear to look at each other when seen from afar. But as you approach them, you realize that the sisters are looking directly at you!

The illusion is a hybrid image that combines two pictures of the same woman. The overlapping photos differ in two important ways: their spatial detail (fine or coarse) and the direction of their gaze (sideways or straight ahead). The images that look toward each other contain only coarse features, whereas the ones that look straight ahead are made up of sharp details. When you approach the pictures, you are able to see all the fine detail, and so the sisters seem to look straight ahead. But when you move away, the gross detail dominates, and the sisters appear to look into each other's eyes.


Elusive Arch illusion by Dejan Todorovic
Used by permission of Dejan Todorovic

Is this an image of three shiny oval tubes? Or is it three pairs of alternating ridges and grooves?

The left side of the figure appears to be three tubes, but the right side looks like a corrugated surface. This illusion occurs because our brain interprets the bright streaks on the figure's surface as either highlights at the peaks and troughs of the tubes or as inflections between the grooves. Determining the direction of the illumination is difficult: it depends on whether we consider the light as falling on a receding or an expanding surface.

Trying to determine where the image switches from tubes to grooves is maddening. In fact, there is no transition region: the whole image is both "tubes" and "grooves," but our brain can only settle on one or the other interpretation at a time. This seemingly simple task short-circuits our neural mechanisms for determining an object's shape.


floating star illusion by Joseph Hautman, aka Kaia Nao
Used by permission of Joseph Hautman, aka Kaia Nao. Copyright © Kaia Nao

This five-pointed star is static, but many observers experience the powerful illusion that it is rotating clockwise. Created by the artist Joseph Hautman, who moonlights as a graphic designer under the pseudonym "Kaia Nao," it is a variation on Kitaoka's Rotating Snakes Illusion. Hautman determined that an irregular pattern, unlike the geometric one Kitaoka used, was particularly effective for achieving illusory motion.

Here the dark blue jigsaw pieces have white and black borders against a lightly colored background. As you look around the image, your eye movements stimulate motion-sensitive neurons. These neurons signal motion by virtue of the shifting lightness and darkness boundaries that indicate an object's contour as it moves through space. Carefully arranged transitions between white, light-colored, black, and dark-colored regions fool the neurons into responding as if they were seeing continual motion in the same direction, rather than stationary edges.


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