Who's Climbing Out of the Stone ?

Have I broken my golden rule of every corner being 90 degree, well if I have may I apologise but before you rush to complain please take a very close look at this corner and look directly above the street sign "The Sanctuary". You should see a bearded man dressed in a robe climbing out of the stonework.

Who is he ? Why is he escaping the stone ? What is he actually doing ? These are all valid but also very interesting questions that need answering.

You should also note that the other wall on Great Smith Street SW1 has another man exiting the Stone wall under the window ledge. He doesn't have a beard but he appears to clutching something, at a guess I would say a book or manuscript.