Greyworld to create a piece of public art in the town. The artwork, called "Invisible," is a series of nineteen ultraviolet paintings placed around the town center displaying "public heroes" – outstanding local citizens who have left their mark in the town. The glowing paintings are best seen at night time. They appear as the nights grow longer, throughout the year. Clockwork Forest (2011) A series of clockwork keys appeared throughout the Ridding Wood trail, in the Grizedale Forest, UK in October 2011. Each key, when turned, generated a music box melody, that can be heard coming from the branches. A permanent work, it was commissioned by the National Forestry Commission. Trafalgar Sun (2012) For their most recent artwork, greyworld created a large spherical self illuminated "Sun" which was installed in Trafalgar Square, London for one day only. Weighing 2.5 tons, and using 210,000 watts of power, the Sun illuminated the Square for three hours after sunset. References External links Greyworld Official website Chris O'Shea interviews Greyworld Icon magazine feature on Greyworld We-make-money-not-art has lunch with Greyworld Bubbletank (2003) experiment Bruce Sterling blogs about Railings (1996) for Wired Magazine Trafalgar Sun report English artist groups and collectives English contemporary artists Outdoor sculptures in London