Maurice Sendak worked for three years creating works in this medium at (*) F. A. O. Schwarz.  
It's not "incoherent sculpture", but Salvador Dali included a bathtub with three severed arms in it for a piece intended for this medium.  L. Frank Baum published an influential text on the art of decorating works in this medium.  A groundbreaking 1977 work in this medium added toy rats and punk-inspired collars to the central figures and was created by a man who also made "Food Fight" and "Warholiday" in this medium.  Those works were made by Simon Doonan.  Maurice Sendak worked for three years creating works in this medium at (*) F. A. O. Schwarz.  One of the first modern works in this genre featured scenes from Uncle Tom's Cabin and was the idea of R. H. Macy.  The unveiling of these things was a major event kicking off the holiday season at department stores.  For 10 points, name these parts of stores that advertised their wares to pedestrians.
It's not "incoherent sculpture", but Salvador Dali included a bathtub with three severed arms in it for a piece intended for this medium.  
shop windows [or window displays or window dressings or department store window displays; prompt on dioramas or toy displays; prompt on Barneys New York before mentioned]