 ", consisting of a small birdcage containing a thermometer, cuttlebone, and 151 marble cubes resembling sugar cubes.By the time of the Surrealist Exhibition of Objects in 1936 a whole range of sub-classifications had been devised—including found objects, ready-made objects, perturbed objects, mathematical objects, natural objects, interpreted natural objects, incorporated natural objects, Oceanic objects, American objects and Surrealist objects.At this time Surrealist leader, André Breton, defined ready-mades as "manufactured objects raised to the dignity of works of art through the choice of the artist".