4 Earth 2 Mars Holding B.V.

4 Earth 2 Mars Holding B.V. develops Circular Architectural Techniques (CATs)—a modular, regenerative building system that empowers communities to co-create affordable, sustainable habitats using local materials. Rooted in circular Design, Origami, and Geometry (DOG) , CATs&DOG reduce emissions, waste, and construction costs while enabling resilience across diverse environments.

We are building toward a future where 1 in every 3 people living in slums and facing the climate crisis is not an option. Our mission is to form cross-sector international R&D partnerships to develop and scale CATs&DOG globally—transforming the construction sector through radical collaboration and disruptive innovation.

From slums on Earth to settlements on the Moon, we are redefining what it means to build for people and planet.