We learn about the physical properties of materials and how they behave with the laws of physics, without directly studying physics. By putting materials together in different objects we learn in a practical way about hardness, friction, torsion, tension, resistance to liquids, density, to name a few examples.
DESIGN
Design becomes an important ingredient. Without taking design classes, there is a first approach to aesthetics, because we want the product to be beautiful and functional: whatever we are designing must serve its purpose.