This is cool. Peter Erskine is an artist who uses laser-cut prisms to refract sunlight into large-scale art displays, and the results are fairly stunning:

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Peter places the prisms around historical sites of interest, allowing it to fall on sculptures, architecture, and the surrounding environment. Several of his works use very large heliostats – sun-tracking mirrors – to reflect the sunlight to the appropriate location throughout the day:

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I’m always fascinated by the use of light in artwork (obviously) and this is a fascinating example. More available at the artist’s website.