undoubtedly require not only autonomy, but also self-replication. These capabilities would enable a single Santa Claus machine, given sufficient matter and energy, to construct a project of any size. See also 3D printing Molecular assembler Replicator (Star Trek) Fusion torch References External links the Replicating Rapid-Prototyper Project : RepRap.org Don Lancaster's Santa Claus machine library Seth Rosenthal, Santa Claus Machine, Wired magazine, May 1994 Robotics concepts Artificial life