A lullaby that has existed in so many versions across so many GLMZ communities since its first documented appearance in 2189 that its original form is essentially unrecoverable. What all versions share is a descending five-note melodic figure — clean, slow, immediately memorable — and a lyric structure in which a parent or caregiver tells a child that the light coming through whatever window they can see is borrowed from somewhere warmer and will be returned someday. Shelf versions tend to be unaccompanied or sung over a single sustained drone. Circuit versions add simple percussion. A Tier 3 commercial recording by Amara Solís-Nakamura in 2204 became the best-selling single in GLMZ history, though Shelf residents largely consider that version a dilution.