Not an effect I'd seen before, but incredibly powerful. Anyone know what it's called? @AkiyoshiKitaoka @agshapiro2pic.twitter.com/XxEl2gnW5D
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The illusion is also observed when induced lines are vertically or horizontally drawn.pic.twitter.com/U44nrThOgI
The Buckingham illusion! Amazing!
Found by Buckingham on r/illusionporn during the great pandemic lockdown of 2020
made a simple demo that allows adjustment oblique lines
https://www.openprocessing.org/sketch/859847
The #p5js code is pretty sloppy (don't judge), but it is there for anyone who wants to play.
here is a screen shotpic.twitter.com/C9EVKgzt6x
Interestingly I perceive those rectangles as straight, but the diagonals are wobbly. 
I (almost) can't see the illusion if I close one of my eyes
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