Optical Allusions

If you are looking for some great Optical Allusions, I have a surprise for you! They are really hard to find! Optical Allusions are mystical creatures created out of bad pronunciation or spelling.

To understand what Optical Allusions are, we must consult the dictionary:

Optical:
1. of, pertaining to, or applying optics or the principles of optics.
2. constructed to assist sight or to correct defects in vision.
3. of or pertaining to sight or vision; visual.
4. of or pertaining to the eye.

Allusion:
1. a passing or casual reference; an incidental mention of something, either directly or by implication: an allusion to Shakespeare.

So Optical Allusions are passing references pertaining to the eye.

If you are not interested in these types of optical allusions, I suggest that you google "optical illusion."