The difficulty of the project lay in its technical requirements. We needed a helium balloon of over 6,000 cubic meters in order to raise a ladder
A Firework Ladder to the Sky — and the Magic of Explosive Art | Cai Guo-Qiang | TED · TED
How native speakers pronounce “balloon”
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The difficulty of the project lay in its technical requirements. We needed a helium balloon of over 6,000 cubic meters in order to raise a ladder
A Firework Ladder to the Sky — and the Magic of Explosive Art | Cai Guo-Qiang | TED · TED