Ice Cave Pattern, Breiðamerkursjökull, IcelandBreiamerkursjkull is an outlet glacier of Vatnajkull, Europe's largest ice cap. Getting into these ice caves requires careful timing. They form and collapse with the seasons, and no two visits are ever the same. This particular cave had a ceiling of compressed glacial ice hundreds of years old, shot through with dark bands of volcanic ash laid down over centuries. I was drawn to the patterns. The ash layers flow through the ice like contour lines on a