Kreisel by FORWISS, Passau

Kreisel is an algebraic surface of equation 60 (x²+y²) z⁴=(60-x²-y²-z²)³. **Authors: [Erich Fuchs](https://www.forwiss.uni-passau.de/~fuchs/), [Manfred Kuhnkies](https://www.forwiss.uni-passau.de/de/staff/95/) and [Alexander Zimmermann](http://www.forwiss.uni-passau.de/~zimmerma) from [FORWISS Institute](https://www.forwiss.uni-passau.de/de/projects/64/)** You can download this model directly from [IMAGINARY](http://imaginary.org/hands-on/twelve-algebraic-sculptures) (no login required) Kreisel's image is part of [Herwig Hauser classic gallery](http://imaginary.org/gallery/herwig-hauser-classic) on Imaginary