Think about traveling and being in transit. Are you by yourself? How do you feel in these situations, what do you have to hold onto? You can answer literally and figuratively.
I think about sometimes how when I travel, all I have is myself and my experiences to interpret surroundings. Like riding the subway alone, all you have is yourself and your imagination to make judgements of other people and things. Something to think about. Also, riding with someone else, what do you both bring to the table? How does it affect your view of everyone else you might not know on the subway? or the plane? On the road? so many variables to think about.