This mini craft takes only a minute or two to assemble, and it's just right for launching in a kiddie pool or bathtub.
Trim the plastic triangle to resemble a sail. Cut off the very upper tip (this will prevent the top of the sail from flopping over later), then snip a series of tiny openings along the edge where the mast will go.
Thread the twig through the openings. Press a small lump of clay (if you use too much, your boat might not float) into the shell hull and plant the mast firmly into its center.