How do you make sense of a traveler’s life? Put it in boxes? Organize loose categories of pictures, keepsakes, timelines? I have a collection of coins and crumpled bills, some from countries I’ve been to, others that have come into my possession in ways that remain mysterious to me. Sometimes I feel I should be leaving everything, even my memories, in alms bowls at airports and other crossroads. But I don’t, even though most of what I keep loses its currency. Even a lot of these words.