“Without, perhaps, really knowing, at the early time of the grand discovery, the significance of his own prophetic words, the Professor adds: “This discovery, in its application to the arts and to history, will open a mine of interesting knowledge.” The existence of this faculty was first experimentally demonstrated in 1841. It has since been verified by a thousand psychometers in different parts of the world.
It proves that every occurrence in nature – no matter how minute or unimportant – leaves its indelible impress upon physical nature; and, as there has been no appreciable molecular disturbance, the only inference possible is, that these images have been produced by that invisible, universal force – Ether, or astral light.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 