In this activity, learners make or use pre-made clay beams to scale and proportion. Specifically, they discover that when you scale up proportionally (i.e. keep things the same shape but change the size) weight increases faster than strength. This resource guide contains instructions on how to build beam molds and clay beams, demonstration and inquiry ideas, background information, discussion questions and extensions. This activity works well as a demonstration but it can also extend into inquiry by using the proportional clay beams formed in the beam models as the raw material for investigation.