Graffiti?

Spotted in Princes Street Gardens during a sneaky escape this afternoon.
Hailing from down the road in Dunbar it seems John Muir did the lot - naturalist, environmentalist, ecologist, engineer, geologist, botanist, activist, writer, conservationist.....all between 1838 and 1914.
Bizarrely by the age of 11 he could recite most of the bible!