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A post shared by physicsfun (@physicsfun) on May 8, 2019 at 9:25am PDT

太神奇了！网路上疯传一个怎么转都只会指向一个方向的箭头。

据报道，这个由日本数学家杉原厚吉（Kokichi Sugihara）发明的箭头，无论你把它向左转或向右转，它都只会指向右方。

不过不要灰心，你的眼睛没有问题，很多网友都被骗了。

原来，箭头本身形状不规则，配上影片拍摄角度的关系，让人产生错觉，所以这个箭头怎么转，看起来结果都一样。