I Sat On The Roof And Kicked Off The Moss

That is a line from on of my favourite artists, and I think these are what he is talking about.  The moss that grows all over the place in the UK, like these on a wall at the JR Hospital in Headington.  Found  myself up at the A&E department early this morning and while waiting for the sun to rise decided to take a few shots of all the moss on the wall.