This little boy came upon a large grooved rock. Wiggling his fingers into the pores, he pulled out the pebbles that were nestled inside. He looked up at the tree. He stood up, rubbed his hand along the bark and discovered that it too had tiny grooves like the rock. He inserted his fingers into the tiny spaces. An idea formed. He took the tiny pebbles and inserted them into the tree bark. "I put it back!' he declared proudly.