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:
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:
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.