In a field on the English countryside, G. K. Chesterton stood up from where he had been sitting and exploded with laughter. His outburst was so sudden and so loud that the cows could not take their eyes off him.

Just minutes before, the Christian writer and apologist had been miserable. That afternoon he had been wandering the hills, sketching pictures on brown paper using colored chalks. But he was dismayed to discover he had no white chalk, which he considered to be essential to his artwork. Soon, though, he began to laugh when he realized that the ground beneath him…