For better or worse, zoos are how most people come to know big or exotic animals. Few will ever see wild penguins sledding downhill to sea on their bellies, giant pandas holding bamboo lollipops in China or tree porcupines in the Canadian Rockies, balled up like giant pine cones.

Flying has changed how we imagine our planet, which we have seen whole from space, so that even the farthest nations are ecological neighbors. It has changed our ideas about time. When you can gird the earth at 1,000 m.p.h., how can you endure the tardiness of a plumber? Most of all, flying has changed our sense of our body, the personal space in which we live, now elastic and swift. I could be in Bombay for afternoon tea if I wished. My body isn't limited by its own weaknesses; it can rush through space.

The brain is only three pounds of blood, dream, and electricity, and yet from that mortal stew come Beethoven's sonatas. Dizzie Gillespie's jazz. Audrey Hepburn's wish to spend the last month of her life in Somalia, saving children.

We tend to think of memories as monuments we once forged and may find intact beneath the weedy growth of years. But, in a real sense, memories are tied to and describe the present. Formed in an idiosyncratic way when they happened, they're also true to the moment of recall, including how you feel, all you've experienced, and new values, passions, and vulnerability. One never steps into the same stream of consciousness twice.

Poetry is an act of distillation. It takes contingency samples, is selective. It telescopes time. It focuses what most often floods past us in a polite blur.

The heart is a museum, filled with the exhibits of a lifetime's loves.

Who would drink from a cup when they can drink from the source?