### Enneper's minimal surface

This is a minimal surface with a very simple definition. Despite this it is hard to
visualize because of self intersections. You can clearly see two holes through it
in the shadows
Polynomial form:

((y^2-x^2)/(2*z)+2*z^2/9+2/3)^3-

6*((y^2-x^2)/(4*z)-(1/4)*(x^2+y^2+(8/9)*z^2)+2/9)^2=0

Parametric form:

x=u-(u*u*u/3)+u*v*v

y=v-(v*v*v/3)+u*u*v

z=u*u-v*v

Try u={-2,2},v={-2,2}
Here is the PoV3-source I used

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