The power of the moon can be strong in the dark times. If one goes too long without moonlight, one may be seized by melancholia and gloominess. Therefore one hangs a brass-ring in the smoke-opening to stop the power of the moon. But it could also be good to offer some reindeer meat, so that the God of the Moon stays in the sky without disturbing the people. At the same time a brass-ring may protect you against gloominess.