Doctor John Perry decided it was time to go home. It had been a perfect day, a day alone, the first such day in many years. He had filled his bag with all sorts of seashells enough to study for months. The island had been a good place to find shells, but now the sun was going down. He must leave before it got dark. He picked up his bag of shells and walked toward the edge of the island. He came to the sand reef that connected the island and the shore of the mainland. He stopped for a moment to enjoy the sunset on the ocean water. Then, he began to walk along the sand reef toward the shore. He walked slowly stopping a few times to rest. He began to whistle. Along with nature all day, it had cheered him. He could see the shore.