When the caster makes a motion, usually snapping their fingers, a serviceable chair made of non-breathable air appears. The chair has a back and three evenly placed legs (for better balance/ not sitting crooked), if the caster desires it can have a swivel motion like a bar stool. This chair is rooted to wherever it was summoned, anyone but the caster who goes to interact with it go right through. The chair must be thought about to maintain it's form.