The Gravity Cone is an unassuming device, two irregular slabs of black metallic stone that just barely fit into a man's outstretched palm. Carefully tracing one's fingers over the surface or shining a light at an angle reveals a tapestry of razor thin squiggles carved into the material. Delicate hinges surround the edges, making it seem impossible to open.
Taking a rubbing of the etchings is difficult, but possible. Occult likens them to a specific crop circle design made by hovering spacecraft. Supposedly they're the impression left behind by an 'antigravity drive.' Archeology notes the similarity between one of the patterns and the seal of Antaeus. In one version of The Twelve Labors, he first challenged Herakles to lift his halteres, which were impossible for any mortal man to separate from the earth. History compares the alien symbols instead to a series of runes employed by Merlin in one version of the King Arthur legend. Rather than pulling a sword from an anvil (the stone was a later addition), he just picked it up. No one else could lift it because the runes on the anvil increased the sword's weight tenfold for the unworthy.