university filled in the area. The administration built a wooden fence as a new meeting place. The students did not understand why anyone would want to meet at a fence. The administration was about to give up and tear it down, but that night a fraternity, as a prank, painted the entire fence advertising a fraternity party. Ever since, painting the Fence has been a Carnegie Mellon tradition. The Fence at Carnegie Mellon lies at the center of campus, in the area known as "the Cut". Students guard the fence 24 hours a day, and, as long as two vigils are maintained, no other student may "take" the fence. The fence can then be painted by the group that has it, but only between midnight and 6 am. Only hand brushes may be used; the use of spray paint or paint rollers is considered vandalism and results in a fine. The previous paint cannot be stripped, and each new painting adds a new layer. The original wooden fence finally collapsed in the 1990s due to the weight from over 1' of surrounding paint, and was immediately replaced with an identical one manufactured from concrete. Today the fence is considered "the world's most painted object". by the Guinness Book of World Records. Spring Carnival – Usually held in April, Spring Carnival is the biggest celebration of the school year. In addition to classic carnival attractions, the Spring Carnival features the Buggy Races and Booth, a competition between various organizations to build small, elaborate booths based on a theme chosen each year. Buggy Races – Buggy, officially called Sweepstakes, is a race around Schenley Park. It can be thought of as a relay race with five runners, using the buggy vehicle as the baton. Entrants submit a small, usually torpedo-shaped, vehicle that is pushed uphill and then allowed to roll downhill. The vehicles are unpowered, including the prohibition of such energy-storing devices as flywheels. They are, however, steered by a driver who is usually a petite female student lying prone, arms stretched forward to steer via a turning mechanism. Space is so tight inside the buggies that the drivers usually cannot change position beyond turning their heads. Mobot – From the term "mobile robot," Mobot is an annual competition at Carnegie Mellon that made its debut in 1994. In this event, robots try (autonomously) to pass through gates, in order, and reach