Anthony Gormley's project "One and Other" for the Fourth Plinth in Trafalgar Square this summer.
For 100 days, every hour (applicants chosen randomly though also representational of the geographic of UK) a different person will stand on the plinth creating a "monument built in time out of 1 hours of people's lives".
Human skin is the largest organ of the integumentary system made up of multiple layers of epithelial tissues that guard underlying muscles and organs. As the interface with the surroundings, skin plays the most important role in protecting.