3501922 Different forms of snowflakes, 1895 (litho) by German School, (19th century); Private Collection; (add.info.: A snowflake is either a single ice crystal or an aggregation of ice crystals which falls through the Earth\'s atmosphere as snow. Each flake nucleates around a dust particle in supersaturated air masses by attracting supercooled cloud water droplets, which freeze and accrete in crystal form. Complex shapes emerge as the flake moves through differing temperature and humidity zones in the atmosphere;); Prismatic Pictures ; German, out of copyright.