In 2000, Peter Erskine, was Commissioned by the Italian State Railway (Ferrovia dello Stato) to create solar spectrum, rainbow art installations in the Milan, Florence and Rome railway stations and on 30 bullet trains. The project was co-sponsored by the World Wildlife Fund (WWF) as a way to cut fossil fuel emissions by getting Italians out of their cars and onto trains. At four hundred miles long, CROMOS may be the largest artwork ever created.
In the MIlano Centrale station, twin 40 foot by 70 foot, living rainbow beams gradually sweep through the station as the Earth turns. Depending on the time of day and season, the rainbows drench shops, trains, travelers and even pigeons in Nature’s most beautiful light. The Solar spectrum beams are created by what are possibly the worlds largest prism array. There are seventy two, four foot wide and eight foot long flat, laser-cut flat prisms, bonded to the arching skylight windows high in the station's roof.
In Rome's Termini Station, forty four, two foot by seven foot, flat, laser-cut prisms are bonded to the station’s 700 foot long, south facing, clerestory windows. An additional twenty prisms, of equal size, are attached to the west entrance windows. These prisms project giant spectrum beams that gradually sweep through the station. The rainbows change color, shape and intensity every hour, day and season of the year.
In 1989, Peter Erskine created a new, immersive Solar art medium he named Secrets of the Sun: Millennial Meditations (S.O.S.) S.O.S. is about the beauty and dangers of Sunlight: the beauty of the rainbow and the horrors of global warming, ozone depletion and mass species extinction. Erskine leverages the emotional impact of art to address the full range of Nature from her most elemental expression as Pure Light, to her most complex expression as Global Ecology. In his installations, our life-giving star, the Sun, is the energy source, subject matter and medium for the art.
In 1990, word of Secrets of the Sun drew curators and museum directors from around the country to Erskine’s Venice, California studio. In 1991, he was invited to create an installation for the Projects Room at New York’s Museum of Modern Art, and in 1992, the S.O.S international exhibition tour opened in the 2000-year-old buildings of the ancient Roman Forum. His Solar Spectrum Environmental Art has received broad coverage in the global media including seven magazine cover stories in four languages, over 150 press articles, and six global satellite broadcasts. TV and radio stories featuring his work have been broadcast in over 150 countries. Erskine has collaborated successfully, in over 25 public projects in five countries, with project stakeholders; architects, engineers, contractors, railway, government and Arts Agencies, and community members. He knows that all stakeholders play a vital role in developing a narrative that turns into successful and enduring public art.

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