Frank Lloyd Wright Foundation July Fourth Flags Stained Glass Panel Glassmasters. Glassmasters Autumn Sumac Stained Art Glass is inspired by The Frank Lloyd Wright Autumn Sumac that is one of the windows made for the Dana Thomas House in Springfield, Illinois. It has a metal tag at the bottom that says A Frank Lloyd Wright Collection Product Authorized by the Frank Lloyd Wright Foundation. The frame has some scuffs due to age, but is in good condition. However consider that this had been stored in a private residence. Please check the photos for your own impression. 20.6 x 15.0 cm / 8.1 x 5.9. International Buyers – Please Note.