Okay, I’m not going to be able to sleep until I know what the heck that is supposed to be...
Mounted on the ceiling of the Art Nouveau Lucerna Palace in Prague, by David Černý, Czech sculptor.
http://www.theguardian.com/travel/2012/aug/10/david-cerny-sculpture-walk-prague-city-break
http://www.atlasobscura.com/places/upside-down-statue-of-king-wenceslas-riding-a-dead-horse