Bal des Quat'z'Arts ("Four Arts Ball") was a Parisian annual ball, the first held in 1892 and the last in 1966. The event was organised by Henri Guillaume, Professor of Architecture at the École nationale supérieure des Beaux-Arts for students of architecture, painting, sculpture, and engraving. The first ball was held in 1892 in Montmartre. It was modest when compared with later ones, and it was considered a success, though it was immediately put into the hands of organizers. The second event was a costume ball held 9 February 1893 at the Moulin Rouge; along with merriment and drinking. Nude models walked about as living paintings and a nude woman was noted to be standing on a table at midnight.[1][2] A lawsuit arose thereafter.[3]