This document contains instructions and descriptions for a variety of optical illusions, including images with perfect circles, parallel lines, disappearing and reappearing dots, color movement, flowing rivers, impossible shapes, and images that appear different when viewed upside down or through one eye. The reader is directed to stare at central dots or areas in order to see various illusions take effect.

2. Stare at the dot, moving forward and backwards.

3. B Both images have perfect circles in them

4. This image has two perfect circles

5. What’s inside and what’s outside?

6. Impossible shapes A five legephant

8. These pictures have parallel lines

9. The purple squares are not crooked

10. Disappearing dots

11. How many yellow dots do you see?

12. Color movement

20. The 3 flowing rivers

21. Need new glasses?

24. Disappearing colors Stare at the center dots to see stuff disappear

25. Contrast illusions Stare at the center of the following images for at least 30s and then look at a white wall or a sheet of paper.

29. Upside down images

30. Hill or crater?

34. Impossible pictures

37. Same size illusions

39. Drawings

45. Cool images

46. Animated gifs (powerpoint only)

48. Which way are the ferris wheels turning?

49. Stare at the center and the purple dots will disappear

50. Cover you left eye and stare at the left dot to see your blindspot