Elegy: In Coherent Light
*coherent adj. 4. Physics. (of two or more waves) having the same frequency and the same phase or fixed phase difference: coherent light. Collins Dictionary of the English Language.
holography n. the practice of exposing a film to light reflected from an object or objects and to a beam of coherent light; when the patterns on the film are illuminated by the coherent light a three dimensional image (a hologram) is produced. Ibid.
“Every bit of a hologram contains information about the whole scene. So you can snip it into pieces, and [in each piece] see the original scene.” the Observer, 15 May 1966, quoted in Oxford English Dictionary.