The most salient feature of this window are the crystals, actual quartz healing crystals, which protrude from the surface of the panel. The clouds are rendered by a technique of multi-stage sandblast etching on flashed glass. The molecular arrangement of crystallized water, i.e. ice, is shown, in the circular designs at bottom. This window, on the theme of the second day, is all about the three states of matter, how liquid becomes solid and dry land emerges from the sea .