The sense of embodied presence is the harmonious meshing of exteroception, proprioception and interoception - outer world, your gesture in that world, and your internal bodily states. All of these are dynamic, are continually being updated, achieved and released and attention is actively and subliminally bringing about these about by closing and reopening the gaps. This is what it feels like but none of this actually creates presence, rather they harmoniously crystallise and bring to realisation a quality latent in awareness. Change any part of it and presence doesn't go away, it simply finds itself in an altered world.