I'm suppose to indicate whether glass, steel, and wood are considered meaningful or not meaningful. I'm really not sure what this means. I'm going to guess, meaningful.
They're only meaningful if you use them. They mean something to most of us because our homes and work places are made of glass, steel, and wood.
But consider people who have very little of these products. They build homes of stone, sun-dried brick, animal skins, grasses, concrete blocks, and other materials. Are glass, steel, and wood meaningful to them?