Chair

A tetrahedral surface looking like an inflateable chair from the 70's.
Implicit form:

     (x^2+y^2+z^2-a*k^2)^2-b*((z-k)^2-2*x^2)*((z+k)^2-2*y^2)=0 
     with k=5, a=0.95 and b=0.8.

Here is the PoV3-source I used
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