One of the things that John Pawson came across when he and Swarovswki were researching his 2011 London Design Festival installation  Perspectives at St Paul's Cathedral was a sketch by Sir Christopher Wren of a giant hailstone. Following an extraordinary storm on March 16 1667, Wren clearly became fascinated by the regular shapes of the crystals and drew them in his sketchbook, later discussing the shapes at a meeting of the Royal Society.

To commemorate this remarkable natural event, and to celebrate the 300th anniversary of the completion of Wren's St Paul's Cathedral, Swarovski has created a set of crystal hailstone mementoes based on Wren's sketches. The Swarovski crystal material delivers a dazzling impression of the wonder Dr Wren would have felt seeing the hailstones fall.