Bamboo tube and laser: what they have in common

1. Step 1. Bamboo tube — is part of — Fire lance. A barrel with a gunpowder charge.
2. Step 2. Fire lance — is made of — Paper. The barrel of a fire lance is a paper or bamboo tube.
3. Step 3. Paper — is material for — Paper money. Paper.
4. Step 4. Paper money — has part — Security hologram. Protecting banknotes.
5. Step 5. Security hologram — is a kind of — Holography. A hologram.
6. Step 6. Holography — uses — Laser. Coherent light.

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