In order for commuters to enjoy the wait for a train or bus, for neighbors to enjoy the public space or for anyone to enjoy a performance or linger over an exhibit, we think they need to be able to pull up a seat and stay a while.
Seating might take the form of movable café tables and chairs and/or stationary benches, but placed in a way to leave the center of the Hub open for exhibits and performances (shown below in the plaza concept).