Soot Box

A large box at one end of which is a mechanism that dispenses a shower of soot once every minute into an inside chamber. At the other end is an observation window through which the spectator looks into the chamber and sees two potted geraniums being showered with soot and gradually dying. The box is leaky, meaning that the viewer gets soot on their clothes and begins to choke after they have been in the room for a short time.