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This pic is helpful for a 3D look at the same: https://en.wikipedia.org/wiki/File:Willis_Tower_tube_structure.svg https://en.wikipedia.org/wiki/File:Willis_Tow
by 001sky 12y ago
This pic is helpful for a 3D look at the same:
https://en.wikipedia.org/wiki/File:Willis_Tower_tube_structure.svg https://en.wikipedia.org/wiki/File:Willis_Tower_tube_structu...