The photo credit on all photos is Brad WernerPhoto CaptionsFig 1: Sorted polygons approximately 0.5m across north of DenaliHighway, Alaska. Rocks and boulders (dark) form the outline forpolygonal-shaped domains of sand and gravel (light), which develop viaself-organization by repeated freezing and thawing.Fig. 2: Sorted polygons and stripes formed in the basin of a seasonallydesiccated pond in the Tangle Lakes region of Alaska.Fig. 3: Sorted stripes grading into sorted polygonssubmerged in a seasonally desiccated pond in the Tangle Lakes region of Alaska.