This is from within the ice cave, a tiny section of a wall over 90 feet high. The ice was so clear, you could readily see the entrapped bubbles, and these pieces of lava. I was struck by the pattern and shape which alternately reminded me of an ink blot test, or an Asian painting. The blue color, I was told, is because the light is "filtered" through the 90 feet of ice such that only the blue wavelengths remain.
This is one of a series of square format images in this gallery. Around WWII, 35mm cameras became the dominant format. These typically produce an image with a 3:2 ratio (which is what most of the images in this gallery measure). But every so often, the image works better in a much older format: square.