Structures
A structure carries a load without falling over, bending or collapsing. Triangles, folded profiles and a wide base make it strong.
Why
Why does a sheet of paper between two books sag straight away, while the same sheet folded carries a pile of coins?
Lay a sheet of paper as a bridge between two piles of books and it sags under its own weight alone. Fold the same sheet into a gutter and suddenly it carries a whole row of coins. Not a gram of paper has been added.
The difference is the shape. Engineers who design bridges, towers and roofs use the same tricks: they fold, they build with triangles and they give their structures a sturdy base. That way you get a strong structure from little material.
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