This Frank Lloyd Wright gift set of four coasters is inspired by his Coonley Playhouse art glass design of the window triptych from the Avery Coonley Playhouse, Riverside, Illinois, 1912. This Frank Lloyd Wright design is believed to have been inspired by a parade with colorful balloons, flags and confetti. The design is one of Wright's most important decorative achievements. Each Frank Lloyd Wright coaster is 4" square, made of original CoasterStones porous sandstone and is cork-backed to protect furniture and prevent scuffs. Coaster Stand sold separately.