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In chemistry and chemical physics, a mesophase or mesomorphic phase is a phase of matter intermediate between solid and liquid. Gelatin is a common example of a partially ordered structure in a mesophase. Further, biological structures such as the lipid bilayers of cell membranes are examples of mesophases. Mobile ions in mesophases are either orientationally or rotationally disordered while their centers are located at the ordered sites in the crystal structure. Mesophases with long-range positional order but no orientational order are plastic crystals, whereas those with long-range orientational order but only partial or no positional order are liquid crystals.

\"Souvenir\" is a song written by Paul Humphreys and Martin Cooper of English electronic band Orchestral Manoeuvres in the Dark (OMD), and released as the first single from the group's 1981 album Architecture & Morality. Sung by Humphreys, the track is characterised by its use of slowed-down choral loops, and showcases OMD's early approach of utilising a synthesizer hook in place of a vocal chorus. The song has garnered praise from critics and fellow artists.