… under a full moon is only possible at night, of course, and on a limited number of nights. On a crisp January night the bubbles float solidly and stolidly upward and then break ranks as if inward driven, not wind blown. When they pop it is with a definite loudness that seems not just because day sounds are absent; there is a politic interval between pops. They capture the moon's light on both their outer and inner surface.
One only stops blowing bubbles under a full moon in January because one's hands become uncomfortably cold and somehow putting on gloves is not even considered.