Optical Illusions

[Thorpesaurous]

Only once have I been able to get the dancer to switch, and this one I couldn't get at all.

That head moving dinosaur is from a youtube channel called Brusspup that has a bunch of good ones.

[Jasi]

I don't think the last gif is supposed to switch.

The dancer, I manage to switch at will

[Practice?]

These are always cool.