Whose idea is this?

[JHostler]

Something so simple couldn't possibly be new, so whose concept did I just resurrect?

There exists a class of optical illusions wherein an image rotated 90 or 180 degrees resembles something completely different. Specifically, I'm thinking of a photo of a person leaning against a tree on a lakeshore. When rotated, it is apparent that the lake is actually the sky and she's lying (not leaning) on an uprooted tree. In short:

Show spec1 to left... rotate while turning to show spec 2 on right... top switch... aud = reality 3. Nobody's description matches.

There are numerous presentational options, of course, but this is the root. Who owns it?

John

[Jack Shalom]

Several magicians who have work on ambigrams, but the picture angle is new to me.

These are nice too:
https://www.tumblr.com/search/symbiotogram

[Brad Henderson]

I have used the bunny/duck illusion to create multiple realities as part of a magic performance. two people on stage. show a pic of an abstract drawing to each of them and the audience. ask which animal they felt tney saw in the image. Reveal you influenced each person to 'see' that particular image and how you allegedly influenced them to do so

also used this as a personality test as part of a 40th birthday presentation

[Leo Garet]

Anybody ever "see" Bunny/Penguin?
I use this ambigram as sort-of proof that sometimes we see things that aren't there and sometimes we don't see things that are there.