Annabel Ralphs, UK
A longstanding fascination with the sea and a love of reading on beaches has led to this series of waterproof bookmarks. The diagram on
the back is 'the rule of twelfths', a rule of thumb which estimates the height of the tide to a sequence of 12ths 1: 2: 3: 3: 2: 1. The image
on the front of the bookmarks is from a series of photographs of crystals formed from evaporated sea water magnified X1600.