Someone else's math

Posting here for the sake of posterity because this is the story I want to remember. Also that day in 2018 when I went for what I thought was going to be a friendly, casual conversation and was ambushed with whiteboard exercises.

Six views from Ocean Beach

Ocean Beach is a short ways up the coast from Mussel Rock. Prints of the first drawing are available for sale. Prints of the others, as well as the original drawings themselves, may go on offer shortly.