fata morgana: a mirage in the Strait of Messina (attributed to the Arthurian sorcerer Morgan le Fay)
mirage: an optical illusion in which atmospheric refraction by a layer of hot air distorts or inverts reflections of distant objects
quasiparticle: a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle