Experiment
The Cube That Won't Sit Still
This is a Necker cube: a wireframe drawing with no shading or occlusion to tell your visual system which face is actually in front. The 2D drawing is equally consistent with two different 3D shapes, so your brain has to pick one, and it can pick either.
Stare at it for a while. It should spontaneously flip between the two readings on its own. You can also nudge it on purpose: try tinting one face and see how quickly the interpretation locks in.
Now try free viewing. Remove any tint, watch the untinted cube, and click the button below every time it flips for you over the next 20 seconds.
20 seconds remaining
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