Yet the building's Beaux Arts style of architecture, which was designed 100 years ago, is all about the people who walk through it.See Grand Central Station at Wikipedia.
"Beaux Arts design is based first and foremost on the importance of the individual," says urban historian Justin Ferate. "Every architectural detail in the space has some physical relationship to your body and that's very import because it helps you figure out where you are."
The architecture of the building is as much about psychology as it is about style. Every single corridor is designed to create a sense of consciousness and comfort.
"If you look around the Grand Concourse, you’ll find that the railings are roughly your waist height. The counters are just the right height to be leaned on," Ferate says. "Each block of stone in the upstairs concourse is one footstep wide for walking and one footstep long for running. And because the blocks relate to your physical movement, you use it subliminally as you run across the platform."