Thanks Davy, really useful look on things :)
You’re right it’s an in person activity and comes mainly from when I’ve explained things to people in the past. It’s a really good way to explain something complex as you can gradually build the picture by adding things to your drawing as you go. Also I often use it to explain technical things to non-technologists as they can understand the shapes I draw but not necessarily the jargon I’m saying.
I don’t think this method is very readily used in the world though! :)