A 3D printed arrow by mathematician and sculptor Kokichi Sugihara uses curves and angles that the brain can't register to make it look like it always points right.

@isagalaev @yogthos it's caused by the shape of the lightened & shadowed parts.

@yogthos "Curves and angles that the brain can't register"? Looks like just a complex 3D body that results in an arrow pointed rightwards when projected on appropriately located 2D surface. Nothing to do with brain.

One could as well say that cylinder "uses curves and angles that the brain can't register" because it looks as a rectangle from a certain point.

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