We can thank my friend Kat of Adventures in a Campervan for this one. She spotted it Griffin Park, Blackburn, way back in August (sorry, I’ve had quite a backlog of street art to catch up with!) and sent me this photo together with a message.
Here’s one for you. As a maths teacher I love it. They’ve chosen the data they want to collect and chosen methods of collection and recording, they’ve made a key, maybe they made a prediction before they did it of how many waves they would get. Practical maths in action!