Entitled »Society for Amateur Ornithologists«, Dion transformed the barrel-shaped vessel into a free-standing, walk-in edifice. To one side of the entrance with a roofed porch and stairs a large window opening was inserted into the side wall and two windows installed in the ceiling where previously supply pipes had been connected to the tank; in addition, a small observation platform was built onto the roof. In contrast to the tank’s plain outward appearance, its interior has been fitted with sophisticated furnishings. Reminiscent of a clubhouse, it brings to mind images of 19th-century curiosity cabinets. The artist furnished the space with old carpets and antique furniture, supplementing it with numerous ornithological objects and books he had purchased from various flea markets around the region. Aligned telescopes, books opened up on the bureau and crystal bowls filled with sweets give the impression that a hobby ornithologist has just left the observatory. Visitors are encouraged to use all the objects in the observatory, thus themselves becoming this same »amateur ornithologist« and part of the artwork – like the birds that allow themselves to be observed from this spot and the process of observing itself.