Wow. Bullseye. Thank you.
Excerpted from wiki. Pretty awesome given the context.
Some early-nineteenth-century Americans used seer stones in attempts to gain revelations from God or to find buried treasure.[6] From about 1819, Smith regularly practiced scrying, a form of divination in which a "seer" looked into a seer stone to receive supernatural knowledge.[7] Smith usually practiced crystal gazing by putting a stone at the bottom of a white stovepipe hat, putting his face over the hat to block the light, then divining information from the stone.[8] Smith and his father achieved "something of a mysterious local reputation in the profession—mysterious because there is no record that they ever found anything despite the readiness of some local residents to pay for their efforts."[9]