optical illusion(n = noun.phenomenon) - an optical phenomenon that results in a false or deceptive visual impression;
is a kind of optical phenomenon
has particulars: apparent motion, apparent movement, motion, movement, mirage
illusion, optical, optical aberration, optical activity, optical bench, optical cable, optical condenser, optical crown, optical crown glass, optical device, optical disc, optical disk, optical fiber, optical fibre, optical flint, optical fusion, optical glass, optical instrument, optical lens, optical maser, optical opacity, optical phenomenon, optical prism, optical pyrometer, optical telescope