Eben has always been an artist of animals, and the rhinoceros copper relief is one of his most ambitious. A massive wall piece, it spans 12.5 feet long and 6 feet tall across five panels, standing 8 inches deep in relief. The first was commissioned; a second was later purchased.

The making is as demanding as the scale suggests. Eben builds a buck, a form shaped from wood, plywood, and bond, that serves as the mold for the piece. He anneals the copper to soften it, vacuum-presses each sheet to the form, then hammers the metal by hand for the final detail. The copper has to move through this cycle many times, shrinking and stretching until it catches every contour, the fold of a toenail, the crease of hide, the weight of the animal's head. He began the process in 2006.

He still has the buck, and believes that one day another rhino will be asked for.