In the South subway tunnel of The Bearpit there are framed areas which graffiti/street artists use to place their works. I think they were originally introduced to keep a little decorum and ‘usher’ artists to use the specified wall areas. To a certain extent it has worked, and they tend to use them to frame their works. Some of the other subway tunnels have the frames and some don’t.
In this example, Decay has taken up two of the frames to create ‘bookend’ pieces that work really well together. It is unfortunate that although I took this picture not long after it was sprayed, it had already been tagged.