神奇的箭头

在Twitter上看到一个有意思的箭头，分享一下（2020.5.1 视频失效，请移步推特）

原twitter

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

貌似日本亚马逊还有相关书籍卖：https://www.amazon.co.jp/gp/product/4487810906

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