You can set the boundaries of your VR space to be really small, so you're always activating the boundary grid. This would give you a frame of reference for the

You can set the boundaries of your VR space to be really small, so you're always activating the boundary grid. This would give you a frame of reference for the real world, and probably reduce your motion sickness. There are actually a bunch of VR games that have comfort options which basically put a static cage around you. Also, similarly, cockpit games are a popular way to allow free movement with reduced motion sickness.