1. Pick a shrub, tree or houseplant that you can use for an experiment.
2. Using the cardboard or aluminum foil, cut out some geometrical shapes like a circle, square or triangle.
Make sure your shapes are big enough to make a patch that will cover nearly half of the plant
leaf.
3. Paper-clip each shape on a different leaf.
4. If you use a house plant, place it near a south, west or east window where it will get plenty of sunlight.
Make notes about the weather each day and add them to your observations.
5. After four days, remove the shapes from the leaves and observe each of the leaves that had a shape
covering it.
6. Compare the areas of the leaf that were covered with the shape to other parts of the leaf.