# Columpius

## Equation

\[ x^3 y+x z^3+y^3 z+z^3+7 z^2+5 z \]

## Properties:

- degree 4
- smooth
- two holes
- unbounded

## Some story

Columpius was not that challenging to decompose. Projection onto x and y again worked well. A sphere of radius 10 appears to match the raytrace on Herwig Hauser's gallery.

input

projection

sphere