Model a residential house entirely carved into a massive tree. The design should seamlessly integrate with the natural form of the tree, utilizing the hollowed interior for living spaces. Incorporate multiple levels within the tree, connected by spiral staircases or natural wooden steps. The exterior of the tree should remain as intact as possible to preserve its natural beauty, while the interior spaces must balance comfort and the organic texture of the tree. Natural light should filter through strategically carved windows and openings in the bark, and ensure proper ventilation throughout the home. The design should evoke a harmonious relationship between human habitation and nature. Key specifications: Multi-level interior carved from the tree’s natural structure. Organic integration of windows and doors into the tree’s bark. Focus on preserving the natural shape and features of the tree. Use of natural wood materials for furniture and finishes. Maximized natural light and ventilation using openings in the bark.