The Color Quiz 
Look at the chart and say the color, not the word
Your right brain tried to say the color
but your left brain was reading the word
How many legs does this elephant have? 
Do you see the face Or an Eskimo?
Do you see a Lady or  Musician?
Are These Lines Straight Or Crooked?
Believe It or Not...     Every Line Is Straight! 

Illusions trick us into perceiving something differently than what actually exists, so what we see does not actually correspond to physical reality.
"Very good, now try again from back there."