We present an early vision of a cyber-physical environment in which computer controlled rendering of physical surfaces, terrains, and environments is achieved by manipulating grids of “moving physical pixels” or “moxels“, whose heights can be raised and lowered on command. A user would be free to walk within such a dynamically deformable physically rendered environment (PRE). The system would be able to create on demand the floor, ceiling and sides of the “Holodeck” in which the person resides, and vary the slipperiness of the surfaces to provide authentic tactile feedback in real time. A user would be able to conduct a walking tour of a remote site, the experience of climbing a steep mountain, or navigation through a maze - all within the bounds of the Holodeck. Multiple users could be networked together to create a distributed cyber-physical system to enable team-based distributed training. We present early results in a Holodecklike simulator, HoloSim.