Any man worth his salt will stick up for what he believes right, but it takes a slightly better man to acknowledge instantly and without reservation that he is in error. - Andrew Jackson
Chapter 4 - Types Of Geometrical Optical Illusions
Many things cause geometrical optical illusions, among them are the location of an object in the visual field, whether the extent of an area is filled or empty, contour, contrast and perspective.
Click the link below to start reading this chapter.
