It is really hard to use the sun to adjust a solar cooker for good unattended cooking because the sun moves about 1 degree angularly every 4 minutes and because it shines everywhere at once. You cannot see the effect of an individual adjustment because it is drown out by all the other sunlight. By using a laser pointer to represent the sun, you can shine it on individual components and adjust them individually (like claymation) until the whole design works well at all the angles you require. This is a classic reverse engineering approach. The solar design T-Square is a simple device to represent the sun and greatly aids the design process. My aim is to design better solar cooker reflectors for unattended cooking. I imagine the sun as a giant spotlight shining down. It moves at about 15 deg