This has been on my friends wall for a long time now. I couldn't rightly determine when I first noticed it, but it's been creeping slowly down the wall for a while now. At first I thought it was a rounded stone sticking out from the wall. After closer examination, it would appear to be a pocket of water behind the paint. I've christened it the 'Wall Tumour'. When poked it jiggles slightly, which disgusts me a bit. With the onset of the snowy weather it has developed a crack visible at the left hand side (see photo). It is a curiosity I've been non-scientifically monitoring and thought needed some attention now as it might not be with us much longer.
