The studio's design for French Dream Towers includes its patent-pending "bio facade" technology.

The concept involves introducing a layer of algae to provide natural insulation, as well as offsetting the building's environmental impact by absorbing carbon dioxide and producing oxygen.

"The culture of micro-algae on the building facade is a process developed by XTU for several years," the architects explained in a statement.

"It allows the symbiosis: the bio facade uses the thermal building to regulate the culture temperature of algae and at the same time these facades allow a much better insulation of buildings."