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Challenge · 5 pictures

Straight or Crooked?

Five pictures of lines that are exactly straight, parallel or continuous — and do not look it. One question each.

Picture 1 of 5 · Geometry

How to play

5 pictures, one guess each

Look at each picture, make one guess, then see it from further back. Your score comes at the end.

  • About two minutes · 5 questions · your score at the end

The pictures

Each one is also an experience of its own, with the explanation of how it works. It is a game about looking — the score says how often the pictures fooled you, and nothing about your eyes.

  1. 1 · GeometryThe Café Wall
  2. 2 · GeometryParallel Lines
  3. 3 · GeometryBowed Lines
  4. 4 · GeometryThe Hidden Line
  5. 5 · IllusionThe Spiral That Isn’t