At one time I was doing a batik technique, that here in this study turned out sort of like a scratch board.
This is a study in how to put ink over water color, or gauche, and then rub it back. I really like doing this, and will make a mental note to get back to it.
It is done on paper, maybe butcher paper, and dry mounted to foam board.
I used to draft plans for prospective projects, mostly housing and stores. I easily did 200 or more a year on average. Every one of those "interpretations" has my initials or name on it. Now that is scary.