This one never works for me. It’s always face up the whole time
It never works for me because there is not really a reference point. All I see is schrodinger’s plates.
I can’t see these as anything but face up?
Hmmmm… maybe it just takes 2 seconds after reading to make your brain click?
Once you see the shadow on the middle left flat big plate the light must be coming from the right (curve of the shadow is wrong for it to be it’s own shadow), so the plates are upright.
Bayesian Predictive Processing accounts of human cognition (in which it’s sometimes quipped that “perception is controlled hallucination”) offer an explanation for this type of optical illusion, also known as the “hollow face illusion”. We have a strong prior belief that plates should be concave (and faces should be convex) because that’s how they’re encountered most of the time in the world, so your brain generates this percept from its own inner beliefs. But then when you’re explicitly instructed to “see” it a different way, you manually override this effect and then you struggle to see them the original way.