Most people never see this “hidden” mosaic. I have been past this mural dozens of times. I would never have known it was there without a Fonthill staff member telling me about it. It is located just outside the a door from the Yellow Room leading to a stairway to the Alcove. The door is normally open covering the mural. The normal flow of tour traffic is from the Yellow Room down the stairs. It is also in a very dark corner. I had to use supplemental flash bounced off the ceiling to capture the colors.
The tiles in the mural are very atypical. They are considered as “Experimental Tiles”. Similar tiles are nowhere to be found. Below is a detail of the mural.