New York City's Grand Central Terminal turns 100 years old next year, and the milestone is being marked with a new logo, created by Michael Bierut and Joe Marianek of design firm Pentagram, based on the clock atop the central information booth in the terminal's main concourse. The hands of the stylized clock are positioned at 7:13, or 19:13 in trainmaster's time, which is the year the terminal opened. Underneath the image are the words "Grand Central" and "100 Years," written in a sans-serif typeface known as Avenir. (The logo will continue to be used going forward, with "100 Years" dropped after 2013.) The Grand Central Terminal is one of New York's most important transportation hubs, serving the 700,000 people daily who use the Metro-North Railroad, the country's largest commuter rail system. It's also a bustling shopping and dining destination, and the design team at Pentagram has built a marketing campaign centered around the word "Grand." See examples of the campaign in the gallery below.