On a train the other day I saw a map on the platform. At first I found the map a little confusing – then I figured out why. Maps show the north at the top, which means left is west. On the train I was on the seats face the other side – so you move sideways. The train was moving eastwards – which was to my left. So the map was backwards compared to my experience. Made me think about the assumptions in the diagrams I draw and read.