A Pensieve is a stone receptacle used to store and review memories. Covered in mystic runes, it contains memories that take physical form as a type of matter that is described as neither liquid nor gas. A witch or wizard can extract their own or another person’s memories, store them in the Pensieve, and review them later. It also relieves the mind when it becomes cluttered with information. Anyone can examine the memories in the Pensieve, which also allows viewers to fully immerse themselves in the memories stored within, much like a magical form of real world virtual reality.