I cast these in bronze for my jewelry class. The assignment was to create two interlocking rings, so I chose to make a plug and socket. It does actually fit together.
I ended up running out of time to make the display so I turned around a panel I made for my painting materials and techniques class, painted it black, attached those silver windy things from a frame hanging kit, and looped together black embroidery thread... I heard art school teaches a person a thing or two about being creative...
Plug and socket rings.