Harmony in Blue and Gold: The Peacock Room (1876-1877) by James McNeill Whistler, is housed in the Freer Gallery of Art, Smithsonian Institution, Washington D.C. The room, which is the only extant example of a Whistler interior, has long been considered a precursor to the popular artistic movement, Art Nouveau. It was originally a dining room in the home of the London art collector and shipping magnate Frederick R. Leyland. In the mid-1870's Leyland had commissioned the architect Thomas Jeckyll (not Whistler) to redecorate this room. Jeckyll did in fact accept Leyland's commission and he is responsible for all the architectural elements still present in The Peacock Room. In the spring of 1876, when Jeckyll was finishing his assignment at the Leyland residence, he asked Whistler to consult on some final details. This invitation is what eventually lead to Whistler's complete re-modelling whereby The Peacock Room, as it is known today was created. This study presents an artist's rendering suggesting the appearance of Jeckyll's interior design, as Leyland had authorized it and as Whistler first saw it. The influence that Jeckyll's room may have had on Whistler's subsequent masterwork is also addressed.