Bridge of Books

I noticed a wide gap between two stacks of heavy hardcover books. It looked like an empty canyon. I found a flat plastic ruler nearby and dragged it over by the tip. Clack. I shoved it across the gap until both ends rested on the book covers. A bridge. I marched right onto the middle. It bowed down a little bit with a springy bounce under my feet. I stood there swinging my arms gently. Very sturdy crossing.