I know that our body is like a simulation living in a simulated environment but I do not know where is the source (自性) that projects this simulation. Our 'state of existence' is like the cats or dogs living in the small display cages in the pet store, sometimes you see them pacing themselves from left to right in the cages because they are imagining themselves walking in the park or something like that. From the Buddha's or infinity perspective, we are also like these pets pacing themselves from left to right in cages and in so doing, we created or 'dream up' the entire universe with 90 billion light-years of space within. So the question is, is the 自性 inside or outside this cage, it is very hard to envisage a state with no 'inside' or 'outside'.