Optical illusions

1
Optical illusions

• These are interesting since we may have similar
  perception problems as we read our exams

2
None of these below are actually moving
3
None of these below are actually moving
4
None of these below are actually moving
5
None of these below are actually moving
6
The horizontal lines are parallel
7
These are not spirals, but circles !
8
Focus on the sign, note the appearance of a
moving green dot
After some time you may not see the pink dots
anymore, just the moving green dot.
9
Fixer le point central en se rapprochant de
lécranpuis en séloignant
Focus on the central dot and move closer and away
from the screen