The Copenhagen Islands

Danish architect Marshall Blecher is planning a new type of public space that will float in Copenhagen's harbor. Called The Copenhagen Islands, the series of floating sections are made of materials that are both sustainable and recycled. They will be an ecosystem of their own, featuring endemic plants, trees and grass above the water which provide a habitat for birds and insects. Underwater, anchor points give seaweeds, fish, and mollusks a new home. The area will be completely free to use and the islands will be moved seasonally between underutilized and newly-developed parts of the harbor.

https://www.marshallblecher.com/copenhagen-islands