It's not a trick, if you're wondering. There actually is something to see.
this post was submitted on 18 Dec 2023
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woahdude
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Yeah these don't work at all for me. Maybe it's me astigmatism or something.
It's funny you say that. I have astigmatism, but I learned to see these on demand before I got glasses to correct it. The tricks all involve getting your eyes to focus farther away than the actual image surface. I could easily see the butterfly while wearing my glasses. Then I read your comment and tried again without my glasses and I could still see something but it was no longer a cute butterfly. Without my glasses, it was an abyssal horror with wings unfolding from other wings in a vaguely butterfly configuration.
Whoa