Seeming figures visual illusions

Kanish Triangle.
There is no equilateral triangle. He just seems.

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Big and small diamonds, too, only seem.
See also McColloff effect.

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Do you see the Necker cube here?

But there is no cube! This is an illusion.

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Do you see black circles at the intersection of white lines?

But the figure does not have a single circle.

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Square, which is not.

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This set of points is perceived as continuously changing patterns of rows and squares.

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The effect of striving for a closed loop

The figure in the upper figure is perceived as a cube, and in the lower only as a set of individual pieces.

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Where do the arrows point?

Outward or inward shape?

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What is it?

Latin "I" or six laps?

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