Jack throws a yellow rubber ball at the FIRST hanging Navajo pattern seen in the film, later he will appear FRAMED inside it just before he enters the party. Notice the reverse shadow diamond shapes he stands above, a right-angle mirror to the blanket. Jack is self confined to a limited number of rooms for the duration of the film and never leaves the interior except to hunt Danny at film's end. The yellow rubber ball will disappear into the hotel, which will THROW it back to Danny just before he enters room 237. At the spot on the floor where HALLORAN's dead body will lie sits Danny's tricycle, with Wendy seeing the OTHER VIEW. Is there a baseball visual joke here? Is Jack pitching and BATTING?