Time for a bit of pen and ink
The top one, an experiment with two different types of ink, non-soluble, and soluble, with a wash of water activating the second without disturbing the first.
The lower one, a very distant memory - I was probably around 14 at the time, so close on 60 years ago - of a boat house on the River Thames. The roof gradually giving way at the time, I doubt it's still there now.