Nozzle's Mouse

There's a town in Southern Wisconsin called Sun Prairie.  There are were several elementary schools.  Royal Oaks was kinda out on the edge of town and it had the best playground equipment.  There was a big wooden structure that had a horizontal wooden cylinder inside.  It was big enough for three or four children, or maybe a couple adults.  If everyone tried walking up the walls, it would spin like a giant hamster wheel.  It was really scary and fun.  That's what this coffee mug reminds me of.