<ul><li>A record-breaking 34-ball, 12-storey tower has been built, consisting of three balls per layer.</li><li>The tower is part of a series of tennis-ball structures, with previous towers having 19 and 25 balls.</li><li>Attempts to build a structure with more than 34 balls have failed without additional support.</li><li>Tower structures with four balls per layer and five balls per layer have also been built, but six balls per layer are physically impossible.</li></ul>

Tennis-ball towers reach record-breaking heights with 12-storey, 34-ball structure

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