Tokyo's Tower of Babel: The 10-Kilometer-High Megastructure Japan Almost Built(tokyoweekender.com)

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Tokyo's Tower of Babel: The 10-Kilometer-High Megastructure Japan Almost Built

https://www.tokyoweekender.com/art_and_culture/design/tokyo-tower-of-babel/

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Born from bubble-era optimism, this visionary building would have housed 30 million people — and swallowed the entire Yamanote Line loop.

The brainchild of Dr. Toshio Ojima, an architect, environmental engineer and urban scientist at Waseda University, the proposed arcology — the proper name for megastructures meant to curb urban sprawl — would have taken anywhere from 100 to 150 years to build. The estimated cost in 1991, the year Ojima made his proposal? A mere ¥3,000,000,000,000,000 — that’s ¥3 quadrillion.