Hard to understand? Image that fades away if you look at it

Swiss philosopher Ignaz Paul Vidal Troxler discovered more than 200 years ago the effect that makes a photo vanish itself. Thus, if you look carefully for more than 20 seconds at this photo you will notice that the image begins to disappear.

The contour get slowly deleted until complete disappearance. However, theoretically nothing happens with the drawing itself. Everything is just in our minds.
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Points that are farthest from the plan at which you stare disappear gradually, and this Troxler effect may be stronger for other models and colors.