by Kirill Kurevlev via Sputniknews After the recent discovery and vanishing of two enigmatic metal structures, looking oddly familiar to that described in the 1968 classic science-fiction book by Arthur C. Clarke, the world is making guesses at the origins of the shiny little monoliths. Could this be our chance to communicate with an alien civilization, or is it just a prank? Another mysterious metal monolith resembling the structure described in the iconic science-fiction novel by British author Arthur C. Clarke, 2001: A Space Odyssey, was found on top of a mountain in central California, a local newspaper reported on Wednesday. According to the paper, the monolith appeared on top of Pine Mountain, near the small town of Atascadero, on Wednesday morning. "The three-sided obelisk appeared to be made of stainless steel, 10-feet tall (3 meters) and 18 inches (45 cm) wide. The object was welded together at each corner, with rivets attaching the side panels to a likely steel frame inside",