Playing cards and aeroplane: what they have in common

1. Step 1. Playing cards — is made of — Paper. Cards were printed on paper.
2. Step 2. Paper — is material for — Hot air balloon. It was lined with paper on the inside.
3. Step 3. Hot air balloon — evolved into — Airship. A steerable balloon.
4. Step 4. Airship — is made of — Duralumin. The frames of zeppelins.
5. Step 5. Duralumin — is material for — Aeroplane. All-metal aircraft.

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