Ladder rungs e joystick: o que têm em comum

1. Passo 1. Ladder rungs — faz parte de — Ladder. Rungs for the feet.
2. Passo 2. Ladder — utiliza — Inclined plane. Climbing to a height.
3. Passo 3. Inclined plane — é utilizado em — Egyptian pyramid. According to a common hypothesis, the blocks were raised on ramps.
4. Passo 4. Egyptian pyramid — utiliza — Lever. Levers were used to move the blocks.
5. Passo 5. Lever — é utilizado em — Joystick. A lever.

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