This one has a surprising amount of movement (click here).

Did you read "A Bird In The Bush" or "A Bird In The The Bush"?

Bunny or Duck?

Relativity of perception.

An Escher-like one.

Another Escher-like one.

A face, or a word?

Does your mind focus on the black or the white?

Supposedly this is an old man, or two people kissing. I have only seen the old man so far.

A very effective illusion.

Stare at this & something is supposed to happen to your perception.

Lines.

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A woman's face, or a guy playing a saxophone?

More relativity of perception.

More focusing on the black or the white.

Old or young woman?