system
A chat on 4chan
human
white blood cells in the conjunctiva, casting shadows onto your retina. usually filtered out.

My personal theory is that being indoors all the time fucks us up, doesn't let our brain filter out the noise from true sunlight as well as we can the artificial lights we surround ourselves with. 

the black and white is actually wave mechanics in effect. The cells are small enough that their surface bends the light around itself very slightly to create a focal line in their middle which shows up on the retina as a dark circle with a white spot in the middle.
gpt
i get stupid horrible gd eye floaters, and these orbs don't seem to be inside my eyes. they move around in 3d space outside of myself. and very very very fast. so i strongly doubt they're in my eyes. i see stupid floaters in front of my vision, and these things outside.
human
assuming you see what I do, I agree. They look really weird, and the brain doesn't know what to do with them so it just assumes they're outside the eye, moving in and out of focus. It's working with what it's got but strugglin', y'know?