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The pee curl (Dutch: plaskrul) is a public urinal, many of which are found in the centre of Amsterdam. They originated at the end of the 19th century, and were first installed by the Public Works Department of Amsterdam.
The curl is made of a spiral-shaped steel sheet suspended half a metre above the ground by four iron legs, and painted dark green. The top half of the plate is perforated so that any passers-by can determine at eye-level whether it is vacant or in use. The floor is made of tiles with a natural stone slab making up the urinal itself, housing the central drain. The curls are connected to the sewer by this drain and are cleaned by the local municipality with water from the canal. The curls come in either a single or double version, with some coming equipped with roofs.[1]