This Prairie style ceiling light box is obviously influenced by the design work of Frank Lloyd Wright. The light fixture itself is 39" long by 25" wide and 12 1/4" deep. The matching ceiling bracket is 34" by 24". The leather straps can be made to accommodate your room height requirements, but are not adjustable once installed.
As shown here in cherry and ebony with leather straps and “sumac” style glass panels. Price: $7,000.