Hexagons are widely considered one of the most efficient architectural shapes. (Think of the orderly inside of a beehive.) By designing each platform as a hexagon, the builders hope to minimize their use of materials.
Ingels said 10,000 is the ideal number of residents, since it would allow the island to achieve "full autonomy" by producing its own power, fresh water, and heat.
Ingels is best known for individual projects like the Superkilen public park in Copenhagen or a pair of twisting towers in New York City. But he told Business Insider that designing an entire city gives him room to expand his vision.
"At the city scale you can achieve more," Ingels said.
The city would not contain any garbage trucks. Instead, pneumatic trash tubes would transport garbage to a sorting station, where it could be identified and repurposed.
"This doesn't look like Manhattan," Collins told the UN. "There are no cars."
The design might allow for driverless vehicles, however, and the city could experiment with new technologies such as drone deliveries.
Cages underneath the platforms could harvest scallops, kelp, or other forms of seafood. Aquaponic systems would use waste from fish to help fertilize plants, while vertical farms would generate year-round produce. Both of these technologies could also help the city remain self-sufficient during a hurricane or other natural disaster.
Overall, the goal is to reduce waste and produce all the food necessary to feed the city's inhabitants.
Oceanix envisions the villages within about a mile of major coastal cities. The platforms could also be towed to safer locations in the event of a disaster.
The platforms would be bolstered by Biorock, a material created by exposing underwater minerals to an electric current. This leads to the formation of a limestone coating that's three times harder than concrete, but can still be made to float. The substance becomes stronger with age and can even repair itself as long as it's still exposed to the current. This allows it to withstand harsh weather conditions.
"Cities really start and fail by how well they manage water," engineer Bry Sarté told the UN on Wednesday.
In a disaster scenario, machine generators could pull air from the atmosphere, condense it into water, and filter it for impurities like metal or bacteria.
In addition to homes, the city would feature a spiritual center, cultural center, and communal library, where residents could rent computers and bicycles as well as books.
All buildings would be constructed out of sustainable materials like timber and bamboo. They're also designed to be disassembled so that future generations of architects can reconfigure the concept.
Ingels referred to his vision for the city as "utopian pragmatism" — the idea that we can accomplish grand design feats in concrete, practical ways.
Not everyone would be amenable to living on water, of course, but those who can't afford high rents in major cities or who want a living situation that's less vulnerable natural disasters could benefit from the concept.
Floating homes might even have a calming effect. Ingels said he lives on a decommissioned ferry, and the rocking helps lull his son to sleep.
People would "never sleep better than they [would] on a floating island," he said.
"I see this, in many ways, as our Apollo 10 dress rehearsal," Victor Kisob, the deputy executive director of UN-Habitat, told the roundtable.
This vision was shared by many of the project's designers, including Ingels.
"This is essentially about exploration," he told Business Insider. "It's going to serve as an amazing prototype experiment for some of the challenges you're going to face on Mars."
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