Spirit slates are 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. Spirit Slates are historical artefacts used in parapsychology, spiritualism, and mentalism, during séances in the late 19th and early 20th centuries. When opened after being held by the mentalist, messages 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. The usage has since transitioned into entertainment mentalism magic.