Special liquid inside this weather cloud crystalizes in different patterns as the air pressure changes. The "storm glass" weather predictor - ancestor of this charming cloud - was popularized by pioneering meteorologist Robert Fitzroy, captain of HMS Beagle (famous for a passenger named Charles Darwin). In this playful interpretation, changes in barometric pressure make the special liquid crystallize in different patterns, mimicking the look of its cotton-ball-like cumulus cousin. This decorative meteorological marvel delights on desks, bookshelves, tables, and windowsills, an imaginative meeting of science and art with a dash of magic. The Beagle’s storm glass circumnavigated South America; yours can accompany you to Planet Weather Nerd. Designed in the United Kingdom. Made in China.