One variety of these entities was elucidated by R.
One variety of these entities was elucidated by R. L. Gregory and P. Heard, who expanded on Hugo Munsterberg's work with his namesake type of these, and Pierce attributed the effects of one to a "boring in" theory later expounded on by Fraser, who compared these to the "twisted cord," or Zollner types. An apparent angular distortion model was developed by Wagner, who described the effects of the canonical Jastrow and Poggendorf types, one of which features two adjacent arcs and the other which features a line drawn through a rectangle. Including examples like the Necker cube and Wittgenstein's duckrabbit, these are, for 10 points, what visual images which either distort a viewer's perception of them or offer multiple possibilities for their visual perception?
One variety of these entities was elucidated by R. L. Gregory and P. Heard, who expanded on Hugo Munsterberg's work with his namesake type of these, and Pierce attributed the effects of one to a "boring in" theory later expounded on by Fraser, who compared these to the "twisted cord," or Zollner types.
optical illusions