One of the reasons I so delight in going to cafés is because I love looking at the mundane day-to-day dealings of life viewed through the eyes of a stranger (me), yet also that of a participator (customer).
This lets me sit and watch two fellow customers idle away the morning waiting for the rain to stop.
Or just watch a veteran waiter work the espresso machine with an ease of movement that is highly enviable.
Or, consider how our choice of footwear can say about our personalities.
In the end, the experience of sitting in a café is similar to being both an insider and outsider all at the same time.