WMMNA has a write-up of the horrifying "Cloaca" project, developed by Wim Delvoye, a series of machines that, when fed a slurry of acids, bacteria, and enzymes along with food, produce feces.
At first, Delvoye thought that it would never be possible to build up this machine of ultimate absurdity. But he received money from a gallery in Antwerp and dedicated it to the realization of the first Cloaca. The Cloaca Original involved a lot of "bricolage". On a later outing, this time in Düsseldorf, the room-size machine was exhibited in a religious setting. He particularly enjoyed the religious metaphors of the location: the machine was meant to look like a god to whom you would sacrifice food, etc.
What a piece of work is man! How noble in reason! how infinite in faculties! in form and moving, how express and admirable! in action how like an angel! in apprehension, how like a god! the beauty of the world! the paragon of animals!
And yet, to me, what is this quintessence of dust? Because it appears to be shit from a shit machine.
Wim Delvoye´s talk at Ars Electronica [We-Make-Money-Not-Art.com]