These are images of individual snowflakes as viewed under the power of specialised microscopes. They say no two snow crystals are alike. When you view snowflakes at these high magnifications, it is easy to see the intricate and delicate structures on each individual crystal. Some of these images were taken under a light microscope, while others are imaged using a scanning electron microscope (and coloured afterwards). Preventing the snowflakes from melting is a tricky business and the microscopists would have to ensure they were using very cold instruments in order to preserve the appearance of the crystals.