Bob's Lesser Demiplane

you create a door to a lesser demiplane that is  empty room 15 feet in each dimension, made of wood or stone. When the spell ends, the door disappears, and any creatures or objects inside are trapped there, as the door also disappears from the other side .Each time you cast this spell, you can create a new lesser demiplane, or have the  door connect to a lesser demiplane you created when casting the spell before Additionally, if you know the nature and contents of a lesser demiplane created by a casting of this spell by another creature, you can have the  door connect to its lesser demiplane instead.