“This much is sure⁠—the moon door, which is clearly operated by the action of moon rays upon some unknown element or combination and the crystals through which the moon rays pour down upon the pool their prismatic columns, are humanly made mechanisms. So long as they are humanly made, and so long as it is this flood of moonlight from which the Dweller draws its power of materialization, the Dweller itself, if not the product of the human mind, is at least dependent upon the product of the human mind for its appearance.”

“Wait a minute, Goodwin,” interrupted O’Keefe. “Do you mean to say you think that this thing is made of⁠—well⁠—of moonshine?”