Phantasmata is an orchestral triptych by the American composer Christopher Rouse. The title is derived from the works of the occultist Paracelsus, who described phantasmata as "hallucinations created by thought."[1] Rouse originally composed the second movement "The Infernal Machine" as a stand-alone piece in 1981, though he later elected to make it the second part of a larger work. Phantasmata was commissioned in full by the St. Louis Symphony and a fellowship grant from the National Endowment for the Arts and completed March 22, 1985.[1]