The die cast bronze sculptures are very cool. Where does one go to get them cast from 3D models? Sounds very expensive to do as a one-off (the author is a developer at Jane Street, which probably explains why they could afford it).
I ordered them from sculpteo — the only service I could find that would do it. Very happy with everything I’ve gotten from them. It is very very expensive if you want to make anything large, but for small jewelry-scale stuff it’s not too crazy. The balloon is seven custom parts so that was pricey ($250 total?), but the other two models were around $50 each.