In the 19th century, mathematicians became interested in the question how mathematical functions *look* *like*. Felix Klein, a German mathematician, had several of such physical models in his lab in Göttingen, and popularized them in America when he brought a boatload to the World's Fair in Chicago in 1893. The photo above shows a model of a Clebsch surface from 1880, designed and presumably built by Adolf Weiler, Klein's grad student. It is kept today at the University of Göttingen.

*Sources:*

- Joshua Batson, This Is What Math Equations Look Like in 3-D, Wired (2014)
- Göttingen University Clebsch's diagonal surface (thanks to Alba Marina Málaga Sabogal for sending us this reference).

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**Yvonne Jansen & Pierre Dragicevic**on**November 1, 2014**, sent by**Saiganesh Swaminathan**. Category: Physical model Tags: education, mathematical functions, plaster
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