Cornish Engine House. Done in 2003 and as the note says, it is a composite. As I recall, I was on a bus along by Zennor and Pendeen way and we passed several of these ruined buildings. It was a good excercise in speed drawing but I didn't have to try too hard to remember what I'd seen as successive engine houses hove into view. They are dotted all over western Cornwall.
In a way I suppose you could say, "When you've seen one, you've seen 'em all." But you can say that about a lot of things. Whatever, this image is somewhat evocative I think. A sort of snapshot.