Abstract: A rigid, portable, and modular outdoor shower enclosure has a base, walls, and a shower fixture. The shower enclosure may be quickly and easily reassembled after disassembly for storage or transportation. When assembled, pegs, sockets, and gravity constrain the shower enclosure in all degrees of motion. Bolts, screws, and other means of affixing the panels to the base and frame are not necessary to make the shower enclosure rigid. The pegs and sockets are not visible when the shower enclosure is in its assembled position, giving the shower enclosure the pleasing appearance of a permanent structure.