MOON-TO-EARTH
CONSTRUCTION INNOVATION
Geometry-driven infrastructure designed to adapt, be serviced and grow over time.
4 Earth 2 Mars is developing CATs&DOG®—a modular, reconfigurable and serviceable construction-system framework intended to improve lifecycle efficiency under extreme resource constraints. The Moon offers a demanding design context and, over time, a potential environment for validating knowledge and construction principles that may also create value on Earth.
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Limited repeatable modules
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Standardised interfaces
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Reconfiguration and repair
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Phased growth
THE INFRASTRUCTURE CHALLENGE
Building on the Moon is not a single-structure problem.
Lunar infrastructure will develop in phases. Missions, crews and operational needs will change, while transport capacity, materials, tools and maintenance opportunities remain constrained.
Designing every shelter, platform or protective structure as a separate solution risks multiplying components, interfaces and logistics.
What is needed is a construction-system approach—one that considers assembly, inspection, repair, reconfiguration, reuse and future expansion from the beginning.
How can a limited construction system support many forms and functions over time?
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Limited transport
Every component must justify its journey. -
Changing needs
Infrastructure should adapt beyond its first use. -
Maintenance and repair
Serviceability must be designed in from the beginning. -
Phased growth
New capacity should build upon what is already deployed.
CATs&DOG® CONSTRUCTION-SYSTEM LOGIC
Self-supporting origami geometry. Many configurations from a limited system.
CATs&DOG® is a geometry-driven construction-system framework being developed around self-supporting folded and triangulated forms created from a limited family of repeatable modules.
CATs&DOG® is not simply parametric design, an origami structure or another geodesic dome. It draws on these methods and precedents, but its proposed innovation lies in integrating self-supporting geometry, a limited module family, standardised interfaces, and reconfiguration, inspection, repair, disassembly and reuse within one lifecycle system.
Rather than prescribing one fixed dome or habitat, the same underlying system is intended to support different forms, functions and phases of lunar infrastructure. As requirements change, assemblies could be adapted and serviced instead of discarded and replaced—reducing component variety while enabling phased growth.
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SELF-SUPPORTING ORIGAMI GEOMETRY
Folded and triangulated forms designed to gain stability through geometry.
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LIMITED REPEATABLE MODULES
A restricted component family capable of supporting diverse configurations.
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STANDARDISED INTERFACES
Compatible connections designed for assembly, adaptation and reconfiguration.
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SERVICEABLE LIFECYCLE
Inspection, replacement, repair, disassembly, reuse and phased expansion.
MOON-TO-EARTH APPROACH
The Moon as a demanding testbed. Earth as the place for scale and impact.
4 Earth 2 Mars is built on the premise that designing for extreme lunar constraints can sharpen how we design construction systems for Earth.
On the Moon, every kilogram, component, interface, assembly step and maintenance action matters. These constraints encourage fewer component types, standardised connections, adaptability, serviceability, resource efficiency and planning across the complete lifecycle.
The exchange should work in both directions. Earth’s construction sector can contribute manufacturing scale, material knowledge, supply chains and real-world deployment. Lunar infrastructure provides a demanding design context—and, over time, a potential validation environment—for new system-level approaches.
The aim is not to bring lunar buildings back to Earth. It is to bring back better ways of thinking about construction systems.
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MOON — SYSTEM DISCIPLINE
Extreme constraints encourage efficiency, adaptability and lifecycle thinking.
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EARTH — SCALE AND DEPLOYMENT
Construction provides industrial capability, practical knowledge and opportunities for real-world application.
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SHARED VALUE — BETTER CONSTRUCTION SYSTEMS
Knowledge can move in both directions to support more adaptable, serviceable and resource-efficient infrastructure.
THE LUNAR LOTUS FAMILY™
Infrastructure needs systems.
Progress needs people who trust one another.
Technology alone will not create sustainable lunar infrastructure—or translate its lessons into meaningful value on Earth. Progress requires long-term collaboration between sectors and people who do not usually engage early enough.
The Lunar Lotus Family™ is an initiative of 4 Earth 2 Mars created to connect space, construction, research, corporate innovation, family businesses, investors and other committed partners around a shared Moon-to-Earth journey.
CATs&DOG® provides the construction-system framework. The Lunar Lotus Family™ develops the human and collaborative network around the journey. Lunar Lotus Bloom™—a one-of-one handmade geometric sculpture—is its first physical artifact and an expression of the geometry, patience and long-term thinking behind the mission.
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THE SYSTEM
CATs&DOG® explores how adaptable and serviceable infrastructure could be created.
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THE COMMUNITY
The Lunar Lotus Family™ connects people and organisations that may help shape the journey.
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THE FIRST ARTIFACT
Lunar Lotus Bloom™ makes the mission tangible through geometry, craftsmanship and story.
PROGRESS AND SUPPORT
From geometric exploration toward technical validation.
CATs&DOG® has progressed from physical folded-paper studies and registered designs to digital configurations, lunar infrastructure scenarios and discussions with space, construction, robotics and research organisations.
The framework was presented during the OHB MoonPort Workshop and Space Resources Week 2026 in Luxembourg. Its development has received financial, technical, legal and in-kind support from organisations including Climate-KIC, Autodesk Foundation through its Technology Impact Program, Rabobank Impact Fund, RVO and the EUIPO SME Fund.
CATs&DOG® remains an early-stage construction-system framework. The next objective is to select one focused lunar infrastructure use case, translate its operational needs into measurable engineering requirements, and then develop representative components and assemblies for comparative laboratory testing.
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GEOMETRIC FOUNDATION
Physical models, registered designs and documented system concepts developed over several years.
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DIGITAL SYSTEM EXPLORATION
Exact Rhino configurations investigating geometric variety, reconfiguration and phased infrastructure.
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EXTERNAL ENGAGEMENT
Presented and discussed with organisations across space, construction, research and innovation.
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NEXT VALIDATION STEP
Mission, engineering, materials, manufacturing, robotics and testing partners are needed to define the use case and progress toward measurable validation.
SUPPORTED BY:
SELECTED PROGRAMS & ACCELERATORS
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COLLABORATION AND NEXT VALIDATION
Help move CATs&DOG® from a system framework toward tested construction logic.
CATs&DOG® remains an early-stage construction-system framework. The next step is to select one focused lunar use case, translate operational needs into measurable requirements, and then engineer and test representative modules, interfaces and assemblies.
4 Earth 2 Mars is seeking mission and operational specialists, alongside organisations with expertise in structural engineering, materials, manufacturing, robotics, autonomous assembly, testing and lunar infrastructure.
A collaborator does not need to address the entire system. A focused contribution—such as joint engineering, structural simulation, prototype fabrication, robotic handling, material testing or lifecycle assessment—could help turn one part of the framework into measurable evidence.
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STRUCTURAL AND SYSTEMS ENGINEERING
Evaluate structural behaviour, joints, tolerances, loads and system integration.
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MATERIALS AND MANUFACTURING
Develop and manufacture repeatable modules and interfaces for physical testing.
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ROBOTICS AND ASSEMBLY
Explore handling, positioning, connection, inspection, repair and disassembly.
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TESTING AND STRATEGIC SUPPORT
Provide laboratory access, pilot environments, technical capability, funding or deployment pathways.