Earthsky.org - 8/23/13, Deborah Byrd
If you were mountain climbing, at a time of day when the sun was low and behind you, and if you climbed high enough to look down into a mist below you, you might witness the shadowy figure of the Brocken Spectre.
It’s your own shadow that you see, cast on the surface of the mists below, surrounded by a halo-like ring of light. The sun must be behind you. You’re seeing your shadow projected in front of you, through the mist.