Richenbach's Aura

Sensitives reported being able to see through metal, the way regular people like you and me see through glass. Rikenbock came to believe that an undiscovered natural force was responsible for these phenomena. He discovered it at work with a pendulum which moved on its own in a bottle when a finger touched the string attached to the bottle top. In order to perceive this ora, rickand buck had them sit for several hours in the dark to attune their senses.