Heavy Water was a temporary installation by James Turrell that was built inside a warehouse in Poitiers, France in 1991. In one corner of the project, a simple combination of a pool and a cube form a mysterious section with counterintuitive architectural qualities. The installation’s interior is outside the cube and a person is outside when they are inside the cube. The water is a surface (the bottom of the cube) and a volume (within the pool), and an envelope (dividing inside from outside) and a space (containing swimmers). In this enigmatic architecture, where a pool plus a room is also two pools and two rooms, every part is a part and a whole. This model, made for a UIC faculty show, reconstructs the pool-room as a complete project, separate from the other parts of Turrell's original installation.