Limestone blocks and glasses: what they have in common

1. Step 1. Limestone blocks — is part of — Egyptian pyramid. Limestone and granite blocks of masonry.
2. Step 2. Egyptian pyramid — uses — Lever. Levers were used to move the blocks.
3. Step 3. Lever — is used in — Optical telegraph. The arms were moved by a system of levers and rods.
4. Step 4. Optical telegraph — uses — Telescope. Signals were read through a telescope.
5. Step 5. Telescope — evolved from — Glasses. The first telescopes were assembled by spectacle makers.

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