Coexistence explored the integration of living and working accommodation and landscaping in a tall tower. Truncated cones stack up vertically, base to base, to form the tower's shape. Upper cones contain apartments of different size that overlook landscaped decks. Lower cones contain offices that overlook the city below. Glazed canopies over the landscaped decks slide open in summer and close in winter. Coexistence has much in common with plans for space destinations. They must all

support and sustain large communities inside giant enclosed megastructures.

Future space bases and colonies must use plants to remove the carbon dioxide breathed by their populations and return it

to the atmosphere as oxygen. Wheat is good at this. NASA life sciences research shows that 11.2 square metres of growing wheat provides enough oxygen for one person to survive in a sealed chamber. Coexistence has 8 hectares of landscaping. With overlapping wheat cycles, it could regenerate the carbon dioxide of 5,000-7,000 persons, well beyond the tower's living and working population.

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