Panels on the left hand side contain geometrical objects that appear distorted (to a human) due to surrounding information.
Panels in the left hand side contain geometrical objects that appear distorted (to a human) due to surrounding information.
Vicente Sierra-Vázquez & Ignacio Serrano-Pedraza, Application of Riesz transforms to the isotropic AM-PM decomposition of geometrical-optical illusion images, April 2010, Figure 1.
Optical illusions vs. not so.
Leo Crabbe