Optical Illusions

Figures tend to be perceived as whole, complete objects, even if spaces or gaps exist in the representation, thus demonstrating the principle of:

Why is it that we can see the panda in the logo and not a bunch of black shapes?

A reversible figure, such as the vase/face figure, makes use of which principle of perception?

The tendencies of humans to group stimuli by similarity and by physical proximity to each other are illustrative of 

Which of the following factors can contribute to the occurrence of visual perceptual illusions?

The Müller-Lyer illusion is an example of a:

Which of the following is a common cause of optical illusions?

The Ames Room illusion is primarily an example of which type of illusion?

What scientific principle is often involved in creating optical illusions?

Which part of the human brain is most involved in processing optical illusions?