Kettle body and telescope: what they have in common

1. Step 1. Kettle body — is part of — Kettle. A container for water.
2. Step 2. Kettle — has part — Pot lid. A cap.
3. Step 3. Pot lid — is part of — Saucepan. A cap.
4. Step 4. Saucepan — is made of — Bronze. Ancient cauldrons were bronze and copper.
5. Step 5. Bronze — is material for — Reflecting telescope. Newton’s mirror was made of speculum metal.
6. Step 6. Reflecting telescope — is a kind of — Telescope. A telescope.

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