The Architect · Caleb · Chicago
Willis Tower
This is the building that solved the tall building. The bundled-tube frame is structural genius you can read from the street.
The 1973 Fazlur Khan tower whose nine bundled tubes let it stand tall — the tallest building in America for decades.
— Caleb, The Architect
The move — Caleb's insider tip for Willis Tower — is in the app.
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