Theme:
Try to find the hidden ring in this busy street picture in 12 seconds
The fascinating Hermann Grid optical illusion
How the Müller-Lyer illusion works
Who is the real boss in office room: a smart puzzle
The captain's age: an interesting riddle
Bridge and torch puzzle: how to solve it
Visual Optical Illusion Test: Did you see the Rotating Snakes or Spinning Discs?
What color is this dress?
Hering illusion: understanding the geometrical-optical phenomenon
This vibrant optical illusion is hypnotic
