The pyramids

The pyramids have stood for forty-five centuries. Widest at the base, they send their own weight downward and settle harder with time. The four faces point to the cardinal directions and the base sides differ by almost nothing. Without a compass, that angle had to be taken from the sky.

첫째 단서 — 구조Widest at the base, narrowing all the way up. The weight is made to travel downward, so time settles it harder. To fall, the base would have to go first — and the base is the widest part.
둘째 단서 — 목적It was built as a tomb: a building raised while alive, for after death. The purpose sat outside a human lifespan, so it was built to outlast one.
셋째 단서 — 질서The four faces point to the cardinal directions and the base sides differ by almost nothing. Without a compass, that precision had to be taken from the sky. Accident does not produce such an angle.

Forty-five centuries on, they are still standing. It is worth asking what holds them up.