More specifically, the impermanence door aspect has to do with mind-moments (the particle model), arising and passing, vibrations, understanding that from which all arises and that to which all returns, understanding the “source” of all reality, the universe strobing in and out of existence, and so on. When the Tibetans talk of the lack of a substantial way of existing or lack of an unchanging mode of being, they refer to the fact that all experience is utterly transient (the wave model) and thus abides or exists not at all but is constantly in absolute flux and ephemeral.
