In Alaska during the winter it is not uncommon for the sky to be lit up like a neon store light display on some nights. The most common colour is a bright dayglo lime green, interspersed with streaks of magenta through to a deep purple. The waves often weave together like a waltz of celestial glowsticks, ebbing and following in a panoramic aerial dance. Needless to say one has to be careful not to become mesmerized while driving -- beats a laser light show by many a mile.