1. Optical Illusions

2. An optical illusion (also called a visual illusion) is characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a percept that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, color, movement), and cognitive illusions where the eye and brain make unconscious inferences.

3. literal
Something is created that is different from the images drawn

4. physiological
The eyes and brain react to different shades of light and color

5. cognitive
You make the brain and eye focus on one aspect of the illusion

6. Is THIS possible?

7. Are the purple lines curved or are they straight?

8. Do you see gray areas in between the squares? 
Now where did they come from? 

9. You should see a man's face and also a word... 
Hint: Try tilting your head to the right, the world begins with 'L' 

11. Are your eyes “tricking” your brain OR is your brain “tricking” your eyes?

12. Cool Paintings

17. Young Lady or Old Woman

18. Which one is
taller?

19. Do you see the skull?

21. What color is the moving dot?

22. Roofers

24. Do the seeds move?

25. Are the dots white or black?

26. How many legs does the elephant have?

27. Please do the following: Look at the above images from your seat in front of the computer; Mr. Angry is on the left, and Ms.Calm is on the right. Now, get up from your seat, and move back 10 or 12 feet. Who’s the angry and calm now?

28. Is the clock moving?

29. How many triangles do you see?

30. How many faces do you see?

31. Try to say the COLOR not the WORD

32. Do you see the bull?

33. Do you see the skier?

34. Do you see the ice cream cone?