From Kook Science
Clairvoyance (from French: clair ["clear"] + voyance ["vision"]; literally "clear vision," "clear-seeing") is a term for the ability to acquire information, particularly visual representations, by means of an extra-sensory perceptive mode, and without the use of any of the normal senses. In spiritualism, this may refer to information obtained by a supernormal communication with other intelligences, incarnate or discarnate.
- Grumbine, J.C.F. (1911), Clairvoyance: The System of Philosophy Concerning the Divinity of Clairvoyance; Also a Treatise on Divination and Crystal Reading, Boston: Order of the White Rose, https://archive.org/details/clairvoyancesyst00gru