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Best for Stairs

Source/credit: Kobi Levi Design

These are high heeled shoes, without a heel, designed by Kobi Levi. If you still can’t figure it out, place your hand over the white space where the heel isn’t.
Or perhaps these shoes are just best for stairs.

More optical illusions:

Floating helmet and wheel

Peacock with its head in the ground

Hole in Cat

Cats

Door handle

Objects

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Best for Stairs

Source/credit: Kobi Levi Design

More optical illusions:

Hole in Cat

Door handle