Saddle Trivalent Tree Pendant, 3D printed by Shapeways.com in transparent acrylic material. In this design the tree is draped on a ``saddle surface", that is, a hyperbolic paraboloid, z = x2 - y2, like a potato chip. The previous version was draped on the cap of a sphere. The curvature is rather gentle, so it does not show very clearly in these pictures.
Rights belong to Alex Feingold