edited slightly -by removing inappropriate information - for the middle school classroom from http://www.slideshare.net/isc/optical-illusions-282035

1. OPTICAL ILLUSIONS

2. Which square is darker, A or B?

4. The ‘brown’ square in the centre top, and the ‘orange’ square in the centre front are exactly the same shade of brown. Don't believe it?

5. Are the two circles the same colour?

6. Which part of the picture is darker – left or right side?

8. What do you see?

9. Do you see a ‘floating triangle’?

10. Are the lines parallel?

11. Totally straight lines?

13. Which is larger – the left or right hand card?

14. The SCINTILLATING GRID – black dots appear at random intersections Focus on a single intersection, the dot does not appear. The dots disappear if you are too close or too far from the image.

15. Move your head back and forward. What happens to the circles?

16. Focus on just the centre circle while moving your head

17. How many circles can you see? Did you see the 16 circles?

19. If your eyes follow the movement of the rotating pink dot, the dots will remain only one color, pink. However if you stare at the black " +" in the center, the moving dots turns to green. Now, concentrate on the black " + " in the center of the picture. After a short period, all the pink dots will slowly disappear, and you will only see only a single green dot rotating.

20. What do you see? Duck or rabbit – or both?

21. How many legs does the elephant have?

22. One face? Or two profiles facing each other?

23. Look at the wildlife painting of a Bengal tiger. Can you find the hidden tiger in the picture?

24. “ the hidden tiger” is written in the tiger

25. The "illusion" is that this is just a picture of coffee beans; but it is not. Can you find a man's face among the beans? If you find the face in 3 seconds or less, the right half of your brain may be more well developed than most.

26. What do you see? In black you can read the word GOOD; but the word EVIL also appears in white letters inside each black letter.

27. What word can you see?

28. What do you see? You may not see it at first, but the white spaces create the word OPTICAL, while the blue landscape spells out ILLUSION

29. What do you see? You probably read the word ME in brown, but....... when you look through ME you will see YOU!

30. What do you see? You should see a face …. but also a word. Tilt your head to the right – the word begins with L.

31. Read what the sign says

32. Read what the sign says

33. Count the people in the picture below. After they shift, count them again!

34. How many deer can you see in the picture? Just the one?

35. How many horses can you see in the picture? Some people see 5, some 6 and some even see 7!

36. What do you see in this picture? Can you see the baby?

37. What do you see? Try blinking quickly!

38. This is called an "impossible object," which means that it's impossible to build. But drawing it is not impossible, as you see in the image.

39. Perpetually ascending staircase... how can the man go up all the time and come back to the same place over and over?

40. IMPOSSIBLE STAIRS

52. DIGITAL BUMPS

53. MOVING HEART

54. 1 length of rope … ..or 2?

58. Two elderly faces, or a larger scene?

60. Julian Beever creates pavement art. Many of his creations are optical illusions, such as this one, where he appears to be perched on a ledge, waiting for Batman and Robin to climb the building and rescue him. In reality, there is just pavement in front of him – the rest is a 'trick the eye'.

61. Can you see the Shark in the picture above. The trick is not to focus directly on the image but try to focus on a point through the image. With a bit of patience and relaxation you CAN do it.

62. What can you see in the picture above? Remember the trick is not to focus directly on the image but try to focus on a point through the image. With a bit of patience and relaxation you CAN do it.

63. What can you see in the picture above? And one final MAGIC EYE STEREOGRAM