Here, at Tillary Street, is a bike and pedestrian entrance to (& exit from) the Brooklyn Bridge. People who have come from Manhattan stop and ask, “Where the hell am I and where is the closest subway?” (A large map is nearby.) This is not the hip and scenic Brooklyn they have been hearing about. FYI, the guy in the photo is wearing a t-shirt of the Milky Way galaxy that says “You are here.”
Pix and other images 
The map on the guy’s t-shirt is simply too “high-altitude.”
If he drills down deep enough, he just might locate himself and get off that bridge ramp.