My friend Senia once described the feeling of being at a professional basketball game by herself as being "alone with people". I very much like this feeling...there is the ebb and flow of humanity, and it feels good to be embedded in it. There are no demands placed on you, and at the same time you can be energized. I like going to the coffee shop for the same reason by myself. It isn't quite the same with going to the movie theater by one's self (too quiet, not enough movement). The feeling as I experience it is similar to liminal spaces, except with people. A good example of a space that is both are airports, trains stations, and bus stations.