"power": Cai Guo-Qiang / Laylah Ali / Ida Applebroog / Krzysztof Wodiczko "memory": Mike Kelley / Josiah McElheny / Susan Rothenberg / Hiroshi Sugimoto "structures": Roni Horn / Matthew Ritchie / Richard Tuttle / Fred Wilson "play": Ellen Gallagher / Arturo Hererra / Oliver Herring / Jessica Stockholder PBS's innovative series ART: 21 combines the sometimes incongruous media of television and art to explore the nature of creativity in the early-21st century. Hosted by a rotating roster of celebrity guests, the series travels the globe to document contemporary artists in their studios as they create works of visual art--from inspiration through execution to completion--for startlingly intimate portraits of the artistic process. Organized around themes of power, memory, structure, and play, this collection presents all four episodes of the series' third season