Optical illusions

Well, this is definitely the most fun I’ve had while making a post.

Inspired by this one from capnphaggit. Images & copyrights: Trifid Nebula (M20) by Marcus Davies,
The Cat’s Eye Nebula and Star-forming region Sharpless 2-106 by NASA, ESA, the Hubble Heritage Team (STScI/AURA).

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