Spirit Slates are historical artefacts used in parapsychology, spiritualism, and mentalism, particularly during séances in the late 19th and early 20th centuries. These devices, a pair of chalkboards bound together with a small piece of chalk inside, were employed by mediums as ostensible conduits for spirits to communicate with the living. When opened after being held by the medium or left untouched, messages would mysteriously appear on the slates, supposedly written by unseen entities. Though these phenomena were later debunked as tricks employed by fraudulent mediums, Spirit Slates remain emblematic artifacts representing an era of fascination with spiritualism and the occult. Their usage has since transitioned into entertainment mentalism magic, illustrating a blend of historical curiosity and theatrical performance.