An “Anchored Environment Generator” generates a physically constrained virtual environment that is molded and anchored to a real-world environment around a user (or multiple users). This molding and anchoring of the physically constrained virtual environment ensures that at least a portion of the physically constrained virtual environment matches tactile truth for one or more surfaces and objects within the real-world environment. Real objects and surfaces in the real-world environment may appear as different virtual objects, and may have different functionality, in the physically constrained virtual environment. Consequently, users may move around within the physically constrained virtual environment while touching and interacting with virtual objects in the physically constrained virtual environment. In some implementations, the physically constrained virtual environment is constructed from virtual building blocks that are consistent with a theme-based specification (e.g., French bistro, space station,
