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okaaay fine, I'll share my "secret source" with you! lol

https://www.google.com/search?q=double+illusion&tbm=isch

Definitely one of the classic "double illusions", although yours is also very well done. Especially like its "subtlety", and the "air of Serat" about it!

Haha google forever! Thank you again @alexpmorris!