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and the Jin Mao Building. This also applies to most other tall skyscrapers since the 1960s, including the world's tallest building as of lc=y 2020, the Burj Khalifa.

Variants

From its conception, the tube has been varied to suit different structural needs.

Framed

This is the simplest incarnation of the tube. It can appear in a variety of floor plan shapes, including square, rectangular, circular, and freeform. This design was first

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