Last year ALS beam physicist Marcus Hertlein was part of a team of artists and scientists that built and activated a giant, surrealistic timepiece at the geographic center of Burning Man. From the top of a 45-foot clock tower, green laser beams like the hands of a clock tracked the hours, minutes, and seconds, shooting horizontally miles into the dust and darkness of the Nevada night. The project was submitted for entry in the Guinness Book of World Records, and it was recently accepted. “Building a sensitive laser and optics system for a very harsh environment and under huge time pressure on a very tight budget, was not an easy task,” says Hertlein. “It couldn’t have happened without the help of a few dedicated people, including Lab employees Russell Wilcox and John Pepper. The huge effort paid off though, it was an amazing sight and I’m glad I was able to be part of this.” Go here for more on Hertlein’s participation, and here for the Guinness Book of World Records listing for the clock.