I bought this book

in the Zürich Kunsthaus shop before even realizing that the cover was an example of an Apollonian circle packing.

Statically, this doesn’t look like much. But with the proper tool, it moves…

(click on the picture to get the movie; more examples here..)

The author is Takahiro Kurashima, and the publisher is Lars Müller.

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I am a professor of mathematics at ETH Zürich since 2008.

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