We've been dogsitting "Mister," beloved companion of one of our Iowa City friends. Mister chases refractions of light. He is also a natural herder. I guess you could say that, when he tears off after a reflection, he's actually trying to wrangle light itself, put it in its place. He's an older dog, so having him around really reminds me of our old dog, Stella. Yesterday Eleanor pointed out that dogs don't have arms. "That's right," I said, "but they have a double-dose of legs - so it sort of balances out."