The expensive, custom-made “Green Monster” covering over the Boylston Street (Boston) retail store glass façade is long gone, but now souvenir pieces of the material are beginning to surface. One person has supplied a photo of an irregularly-shaped piece of the green stuff, about nine inches square. The material is described as being the thickness and strength of ordinary duct tape, and with a very strong, gray-colored adhesive backing. The green covering was removed from the glass two days before the store opened, and workers carefully carted it off in a large debris box. Souvenir hunters apparently took some of the material before it was taken away.
This piece of the “Green Monster” covering includes a seam, where two pieces of the material overlapped when installed on the glass façade. By the way, the actual Fenway Park Green Monster wall is painted with a custom-mixed color that stadium workers specify as “fence green.”

Here is a scan of the actual material, showing the metallic-like, multi-color finish. The green is slightly brighter in this scan than on the material as it appeared mounted on the Apple store glass. You can see the seam in the material running from top to bottom, where it was mounted in sections on the glass.

