In the afternoon as the air heats up, walk down to the creek. From the bank of the river or from the streambed, gather stones. Gather big stones first, stones the size of footballs and soccer balls. Place them at the bottom of the water in a broad semicircle. Gather middling stones next, stones the size of softballs and baseballs. Stack them between and atop the larger stones. Gather small stones after that, stones the size of hackeysacks and ping pong balls. Finally, gather stones small enough to skip across water, marble-sized stones, handfuls of gravel and silt. Adjust and add to the semicircle of stones until every gap is filled. Sit down behind your dam, in the reservoir. Sit down and cool yourself off.