Wright's most sophisticated and challenging window designs were composed of what he called "dancing" triangles. He first designed them for Midway Gardens, a cultural and entertainment complex in Chicago. Similar windows were the Imperial Hotel in Tokyo, but never executed, and for Hollyhock House in Los Angeles.

Wright hung these asymmetrical "dancing" triangles in vertical lines or scattered them through the top of a pattern like the facets of a shattered crystal. The asymmetries and bold palettes of these windows demonstrate his final mastery of the centuries-old craft.