Watermark

I spotted this while visiting a friend's house where the bathroom is being redecorated and the old wallpaper has come down. In case the image gives a misleading sense of wretched squalor I should come clean and admit I've tweaked this to make the lines look much more vivid and darker than they really are - they remind me a little of an old map of a non-existent coastline and I've adjusted the image to bring that out.