Wrong perspective, optical illusion, mistake of the drawing hand? Along similar lines, more brillant, here is a cool graphical work from Daniel Martinez Lara and Kike Oliva. And, finally, the engraving from Escher that inspired one optical illusion and draws from the other’s principles.
It was not trivial, but artificial networks trained to recognize surfaces have the same difficulties to recognize them in 3D optical illusions (as humans have). Source: CNN International, “robots tricked by optical illusion“.
A fairly good one created by Ava7.com.
Stare in the image and see if you can maintain the image fully static!
A classical painting where we can find the skull if we look at the image at an angle (put your head on the side of the screen).
A nice optical illusion from H.J.Verwaal.
The young women is looking back, the old one is looking down. The young woman’s chin is also the nose of the older one.
A nice black and white photo from heavenuphere where the eye can fall easily.