Professor Richard Gregory visited the Cafe Wall in February 2010. Closer view.
Turning all rows of dark "bricks' into light "bricks"
Turning alternating rows of dark "bricks' into light "bricks"
The horizontal lines are parallel & straight.Note: This image is similar to a type of Perspective illusion: Hering illusion
The illusion found with side-by-side replicas of an image of a receding object applies also to a single object, as in this figure. The figure is drawn with parallel sides, yet the impression is of an object that becomes fatter with distance.Note: This image is associated with a type of Leaning tower illusion