Mitchell Feigenbaum discovered an intriguing property of viewing images through cylindrical mirrors or looking into water. Because the eye is a lens with an opening of about 5 mm, many different rays of reflected images reach the eye and need to be interpreted by the visual system. This has the surprising effect that what one perceives depends on the orientation of the head, whether it is tilted or not. I explain and illustrate this phenomenon on the example of a human eye looking at a ruler immersed in water.

中文翻译：

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断掉的铅笔和移动的尺子：在米切尔·费根鲍姆 (Mitchell Feigenbaum) 未出版的书之后

Mitchell Feigenbaum 发现了一个有趣的特性，即通过柱面镜查看图像或注视水中。由于眼睛是一个开口约5毫米的晶状体，反射图像的许多不同光线到达眼睛，需要视觉系统进行解释。这具有令人惊讶的效果，即人们所感知的取决于头部的方向，无论头部是否倾斜。我以人眼看着浸入水中的尺子为例来解释和说明这种现象。