Intro & Brocken spectre
Have you noticed the "rainbow ring" in season 3 intro? This is "Brocken spectre", optical phenomenon. It appears, when the sun shines behind the observer, who is looking down from the mountain into mist or clouds. I personally saw it once (in Tatra Mountains) - my own shadow on the clouds, with a halo-like, glowing rings. Something beautiful.
There was such a superstition amongst Polish climbers: the man who saw a Brocken spectre, will die in the mountains...
Brocken spectre is spherical. Just like stone ring in Glastonbury Grove. Rainbow halo? Rainbow in Norse mythology was a bridge. Between two worlds. Of course it's just speculation, but ... 😉