A cube is an example of a rectangular one of these; A Pink Floyd cover displays a triangular one
More than 14,000 
exhibitors from around the world gathered in its 990,000-square-foot (92,000 m2) 
exhibition space to display examples of ... Two designs, both in iron and glass, 
were singled out for praise - one by... [DOC] [TLE] Chessgames Holiday Present Hunt: Clues Page - Chessgames.com [PAR] Atom Heart Mother (album cover), the 5th album by Pink Floyd.