Yesterday my sister and I walked on the Capital Crescent Trail in Bethesda, Maryland — and I realized this morning that I have no pictures to show for it. No shots of the tree tunnels, of the bikers and skaters and Sunday-afternoon amblers. This is because we were talking as fast as we were walking.

I am for the most part a solitary stroller, walking alone by choice. It’s when I sift through the day’s events, when I jostle myself free of the routine and to-do list long enough for thoughts to surface. Walking has become an essential writing tool. It’s the great “un-sticker.”

But when presented with a willing companion — someone who will walk and talk with me — ah, there’s almost no better way to make the words fly than moving forward together in space.