Borealis — northern lights over a frozen lake

On screen

What Borealis shows

Borealis shows a winter night: a frozen lake surrounded by mountains and snowy fir trees, under a starry sky crossed by the Milky Way. The northern lights spread their pleated curtains of light, green at the bottom, violet or red at the top, with a bright lower edge; the lake reflects their colours between its cracks.

On every beat a wave of light runs along a curtain; on every bar the curtains ripple harder; on every phrase the palette changes, from the classic green aurora to violet, pink and, rarely, red. On an accent a corona opens overhead in a fan of rays for a few seconds. On calm music the curtains slow down and grow pale.