In The New York Times, psychology professor Alexandra Horowitz published an opinion piece adapted from her forthcoming book, On Looking: Eleven Walks with Expert Eyes. An excerpt:

"Nobody in their right mind visits Midtown Manhattan during the holidays. The reason is simple: everyone, it seems, is in Midtown Manhattan during the holidays. Drawn to the scene like lacewings to streetlights, tourists jam the sidewalks, the crowds slow-moving, veering, shopping-bag-laden, and only vaguely walking forward.

New Yorkers normally roll their eyes, but they ought to take a closer look: watching these tourists interrupt the flow of traffic shows us how well pedestrians in our city usually move. This year I slowed down and observed them."

Read the full piece.

Prof. Horowitz's research is in animal cognition, and she is the author of the bestseller Inside of a dog: What dogs see, smell, and know.