One of the principal ways in which Larkin creates excitement in "Coming" is with his ingenious use of meter. The vast majority of English verse is iambic— generally either tetrameter or pentameter, which means a fairly predictable line of eight or ten syllables. Here, Larkin uses the spondees and dactyls of classical Latin and Greek verse in very short lines. A classical hexameter line usually ends with a dactyl, then a spondee. Larkin creates a rising intonation throughout the poem by using these two feet as a dimeter on their own, as though one had chopped off the final third of a hexameter. He does this with his first two lines (evenings must be pronounced as two syllables):
On longer evenings,
Light, chill and yellow...
Larkin varies the meter, but these dimeter lines of a dactyl and a spondee keep recurring, most importantly in the repeated "It will be spring soon."
The unusually short lines lead one to read the poem faster, creating a sense of breathless excitement as the reader rushes headlong toward the last line. The accelerating rhythm is complemented by the crescendo of events with inanimate, then animal, then human participants. We progress with sudden haste from the houses bathed in light and anthropomorphized with foreheads to the single bird singing to the references to childhood and children, and finally to the laughter, in which the poet joins joyfully without understanding its source.