This surface is describable parametrically as:

X(s,t) = 0.05*s*t
Y(s,t) = 0.05*s^2
Z(s,t) = 0.005*s^3 + 0.005*t^3
domain: s [-15, 15]; t [-15, 15];

a rotation <-- way.

rendered as points and solid.