x1 is the audience/enjoying or partaking party of work/performance/program/entertainment/transmission/experience/story/presentation/act x2 (concrete or abstract), via means/mode/expressed in format/using senses x3; x1 watches/listens/reads/experiences x2.
x1 emits light characteristic of/is of the color that is described by/(as) arising from/associated with the approximately twenty-one centimeter wavelength, hydrogen hyperfine proton/electron spin-flip transition (from parallel to antiparallel configuration, id est: from the higher energy state to the lower energy state), electromagnetic radiation