Common cases in Tokyo
Focused thinking time:
Average commute time for people working in Tokyo area is a little over one hour, I think. My time on the commute train is 30 minutes. Nice time to have focused thinking is when the train is really crowded, but I would have enough room to open my book comfortably and read. I would read, think of something then write into the book.
Something about having lots of people around me, each thinking their own thoughts, but staying quite. Commute train in Tokyo is usally very quite for that many people to be riding it.
On the other hand, it’s no good when several people are talking near by, since it gets distracting.
Focused conversation (meeting) time:
It might be during morning or evening commute time. It might be during transit time during the day. I would be riding the train with friends or colleagues on the train, and we usually have a very good conversation. A lot of time, its about (guess!) work.
It’s got to do with people sitting or standing so close together. I wouldn’t sit right next to someone, parts of bodies touching, anywhere else but during a ride in a mass transportation! When someone is so close to you physically, mental barrier seems to break down too.