Contrary to popular belief, it’s not your creativity that’s playing tricks on you. Here’s why your eyes may feel a reality different from that of your neighbor:
- Your contrast sensitivity: Our eyes are not all wired the same way. Some people are naturally more sensitive to nuances of light and shadow.
- The quality of your screen: A high-definition screen can discover details that others completely obscure. Yes, technology plays a role too!
- Your gaze position: Tilting your head slightly or moving away from the image can suddenly know a previously invisible number. Surprising, isn’t it?
- Result: this illusion becomes a fun little test… but one to be taken lightly!
A fun game (but not a medical test!)
Don’t get overly excited because this spiral has no medical significance, even if it can appear to be testing your visual perception. It isn’t a recognized vision test or a way to check for eye conditions.

Nevertheless, it’s still a great method to realize how complicated our perception is. Because our perception is influenced by both our eyes and the way our brain processes the information.