4 Earth 2 Mars Holding B.V.

4 Earth 2 Mars Holding B.V. is developing CATs&DOG® (Circular Architectural Techniques & Design Origami Geometry), a modular, circular construction system for reconfigurable infrastructure on Earth and the Moon. The system is designed for resource-constrained environments, using repeatable geometric modules and standardized interfaces that enable structures to be assembled, expanded, repaired, and reconfigured without unique redesign.

CATs&DOG® combines AI-powered design software, portable local production, modular building systems, and pathways toward autonomous deployment. Originally developed for lunar applications, it is also positioned for affordable housing, off-grid habitats, disaster response, and other low-carbon construction challenges on Earth.

Our flagship initiative, the Analog BlueMoon Circular Village in Noordwijk and Rotterdam, is being developed as a lunar analog testbed and modular village to demonstrate how shelter, infrastructure, and supporting technologies can work together in one integrated environment. The roadmap starts with a 25 m² LunarNomad Yurt MVP and scales toward a larger pilot and, ultimately, a full analog Moon base.

4 Earth 2 Mars has received support from Rabobank Impact Fund, EIT Climate-KIC, Autodesk Foundation, and is engaging stakeholders across construction, circular economy, and space. We are interested in connecting with partners working on robotics, digital design, advanced materials, modular construction, lunar infrastructure, and cross-sector demonstration projects.