Start by looking at the white dot. For a long time. Then, move backwards slowly and you will notice that the red circle will disappear progressively.
![eclipse_of_mars_illusion Eclipse of Planet Mars](https://yloveillusions.com/en/wp-content/uploads/2009/05/eclipse_of_mars_illusion.png)
Start by looking at the white dot. For a long time. Then, move backwards slowly and you will notice that the red circle will disappear progressively.