A scale model of the sculpture "Cloud Gate" in Chicago's Millennium Park.
I made this with TinkerCad using my own shape generator, "Bezier Bean". This model and shape generator are publicly available on TinkerCAD: https://www.tinkercad.com/things/7ECRdzjIHsa
Print this model upside-down with supports and rafts. After printing, cut the supports off with a razor blade. On my Makerbot Replicator, I used 25% infill to prevent sagging and standard quality because the higher bead size of standard quality yields a shinier finish.
A bold idea would be to print this in stainless, then polish the result to a mirror shine.