If you walk west down the Ithaca Commons late on a Saturday night, past Moonies and the State Theatre, the vibe starts getting weird. You see fewer and fewer people, and the people you do see don’t look like students going out to party. The thumping music coming from the bars gives way to a strange quiet. Head down to Geneva and State and you’ll find a “community labyrinth” behind the office of The Sun. This labyrinth, a set of jagged rocks arranged in spirals, is next to a stairway that leads down to a door.