I like work that develops the ingenuity of the boy. On a long mill pond out in Kentucky--this was some years ago--I came upon some boys who were managing a raft propelled by a sail made from two bed sheets. The body of this strange craft consisted of four logs, sharpened at the bow and of varying length, so as to present a wedge point to the water. Across the logs cleats were nailed that kept them together and answered for a deck. A stout pole, secured in front, served for a mast and a smaller pole, with a piece of board nailed to the end, acted as a rudder.