Built as a class project for a 3d printing class. Never tested but seem sturdy enough for a small / light shelve. The goats were taken from a tattoo design http://nirvanaoftime.deviantart.com/art/Tanngnjostr-and-Tanngrisnir-Tattoo-Design-Request-522503520  edited, then extracted using Inkscape.  The rest of the design was created in OPENScad using the celtic knot library https://github.com/beanz/celtic-knot-scad