An optical illusion
Our answer book holds 51 answers to “An optical illusion”, from the first thing anyone would say to names almost nobody would think of. Mirage, Müller-Lyer illusion and Rubin vase are what most people type first, so they score the least. It is a fairly short list: only 10 answers sit in the two rarest tiers, so reaching one takes real knowledge.
The odd entry you read about once tends to score far better than the classroom example. You will find it in stage 46, “Shrink Ray”, of the Science mission. The first stages of every mission are free, and later stages come with the full mission.
PLAY ONLYCLICK FREEThe most common answers
THE CROWD- Mirage
- Müller-Lyer illusion
- Rubin vase
- Necker cube
- Afterimage
- Penrose triangle
- Duck-rabbit
- Moon illusion
These are the 8 answers we rate as most common, out of the 51 we know. They score the least. The other 43, including every rare one, stay inside the game.
How the 51 answers are spread
| THE CROWD | 8 |
| SOME | 14 |
| A FEW | 19 |
| ALMOST NOBODY | 9 |
| ONLY YOU | 1 |
The rarer your answer, the farther your rocket flies. Rarity is our own estimate of how few people would think of an answer. How to play.