It takes between three and six hours to make each snowball, depending on snow quality. Wet snow is quick to work with but also quick to thaw, which can lead to a tense journey to the cold store.

(1996).  
Goldsworthy Andy; Jerry L. London: Viking.

Andy Goldsworthy OBE (born 26 July 1956) is a British sculptor photographer and environmentalist producing site-specific sculpture and land art situated in natural and urban settings.