Quote Originally Posted by Marvo View Post
It would seem, that inverting the colour changes the invisible dot. Also, I checked the animation, when it was still, and there is no green dot, and the grey background it completely colourless.



But what I found though, is that the invisible dot, is the inverted version of the visible dots.

Oh, and yes, this illusion is old. I believe I saw it first about 4 years back.

edit: by the way, this version requires a bit more concentration.
The green dots disappear all at once instead of one by one like in the other one.