What is this picture of?

Is there an old man or a couple kissing?

Faded Circle — Stare at the black dot in the middle, the outer edges of the circle fade away.

Waves — Move the scroll bar up and down to optimize the waves.

Do you see a dog?

Spiral — Is the spiral right? Or is it a grouping of circles?

How many faces do you see?

Diamonds — Switching of stereo match and binocular, rivalry occur

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