1Draw a pair of arcs.

Find a flat box such as a tissue box, cereal box or cake mix box to make into your boat's hull.

With the box's wide side facing up, draw an arc from end to end. The lowest point of the arc should be about 2 to 2½ inches from the bottom edge of the box. Make an identical arc on the opposite side of the box.

2Cut out the box.

Cut the box along the arcs. Staple the side flaps.

3Paint the box.

Prime the outside of the box with white acrylic paint. This first layer of paint should hide the box's print and original color.

Once the white paint dries, paint the box with the boat's final colors. You can use either acrylic or poster paint.

4Cut two triangles.

Cut two right triangles on construction paper or regular copy paper. These two triangles will be your boat's sails—one sail should be slightly smaller than the other. Make them in proportion to the boat's box hull.

5Decorate the sails.

Decorate both sides of the sail with crayons, markers, or colored pencils.

6Glue the large sail to the mast.

A ship's mast is a straight post where the sails are attached. Make one using a wooden dowel or chopstick. The mast should be 3-4 inches taller than the large sail. If the dowel or chopstick is not long enough, tape two together, then trim to the desired height.

Glue the mast along the straight edge of the large sail.

7Put more glue.

Put a bit more white glue on the mast except below the sail.

8Roll the mast.

While holding the mast on both ends, carefully roll it once to glue the edge of the sail around the mast.

9Glue the small sail.

Glue the small sail on the mast. This sail should be pointing in the opposite direction.

10Add clay or styrofoam.

In order to attach the mast to the hull, you will need an anchoring material such as clay or a piece of styrofoam. Roll a small chunk of modeling clay into a ball or cut a piece of styrofoam into a small cube shape. Glue this at the center of the boat's hull.

11Place the mast.

Stick the mast into the clay or styrofoam piece.