Sidney stepped inside his own, messy classroom. There was a smeared pinboard with class photos and math posters. His math class was usually pretty exciting though, because he always fell asleep mid lesson and let his students do what they want.

Right now, he was awake, smoking and pointing at the blackboard with that tired expression and the red eyes.

"What is the number pi?"

The class went silent. A few minutes ago, they talked about coordinate systems. It seemed their teacher forgot that again.