The
Julia sets of polynomials z³+c, for c varying along a curve, stacked on top of each other. The curve ends at 0, so the stack ends in a circle and you can use the thing as a fancy little bowl. The polygonal approximations of the Julia sets have been computed for 14 backwards iterations.
This is a cheaper version of
that product, designed especially with respect to precious metal materials. Because it has thinner walls, it shows more detail but is not available in all of the sizes on materials of the other one.