Rubber band strap and laser: what they have in common

1. Step 1. Rubber band strap — is part of — Tourniquet. An elastic band.
2. Step 2. Tourniquet — is made of — Leather. The strap of a tourniquet is leather.
3. Step 3. Leather — is material for — Submarine. It was covered with leather.
4. Step 4. Submarine — has part — Periscope. A periscope.
5. Step 5. Periscope — has part — Mirror. Mirrors or prisms.
6. Step 6. Mirror — is part of — Laser. A resonator made of mirrors.

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