Mind Blowing Ambiguous Cylinder Rectangle Illusion by Kokichi Sugihara
Adam Rifkin stashed this in Magic!
Top Reddit comment:
The tops of the pieces are not flat, but angled, so that different shapes are seen from different downward viewing angles.
From our position as viewer (camera), we see the actual tops of the pieces at a steeper angle than we see the reflected tops.
Edit: Stop the video at 0:15 to see the tops at 90 degrees, and you can see the angles of the tops.
This is a really cool illusion, but it only works if the camera and mirror angles are aligned just right.
What did I just see???
Shoot... almost woke me up.
Here's from around the 0:15 frame. 1st one is 100% contrast with 0% brightness. 2nd is inverted colors.
Here's another from around 0:15 (with original). Same 100% contrast with no brightness, and inverted colors.
I DO NOT UNDERSTAND THIS
It's all angle tricks. Playing with perspective.