As I reached Tom at his belay point he shouted out to look for the Brocken Spectre, not entirely sure whether we had discovered a new breed of mountain troll I was rather perplexed, until he directed me to turn round and look onto the clouds.
Below me lay a halo, with my shadow within the centre, and surrounding that three more halos. Apparently the spectre appears as a result of optical illision of a climbers shadow being projected onto mist, whilst the halo appears due to diffraction of visible light by uniformly sized water droplets.
