Literally, the chairs. The seating around here is pretty random: all the houses have different furniture, mostly in single pieces instead of sets. The classrooms in the Barn mostly have weird plastic chair-desks (which they use because they were a gift), except for the ones that don't. The other classroom spaces are even more random. The student center will supposedly have locally-made wooden benches (but no TV... that's a rant for another day, I'm afraid). Here are some of the chairs I haven't mentioned.
There are green Adirondack chairs all over Commons Lawn. Here are three at the rock wall known as the End of the World.
This chair is sitting under a tree by Commons. It goes on the porch/patio with its brethren, but I like it better under this tree.
These chairs are shiny aluminum! Not the most comfortable things in the world, but they're amazingly light and I like them a lot. There are also armchairs and sofas in this room.