Two coolest things in birdland this week

This arrow by mathematician and sculptor Kokichi Sugihara can't point left. Here's how it works: It's 3D-printed with a bunch of curves our brains don't register. pic.twitter.com/Xa32GrI7ii

— Khai (@ThamKhaiMeng) August 4, 2019

This kills me everytime I watch it. pic.twitter.com/oJWpHGFgi5

— T (@t_justme) July 30, 2019

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