Cut out one end of the shoe box. Then use the stiff paper to make the three roof shapes shown in the pictures on the right. To test each roof, put it in the shoe box as shown in Step 2. Keep watching the roof through the open end of the box. Explore some more.
Engineers use models to test and study how well things are built.
Your paper roofs are models of real roofs. The flour is a model of snow. You can shower your model roofs with flour, over and over again. After you test a roof, lift it carefully. Tap the bottom and make sure all of the flour falls into the box.