But then later, you might find that it gets more subtle, and shorter, and much more minute, even - the experience of breathing. In deep meditation, there can be a sense of almost not breathing at all. And partly, that's because we hardly need to breathe anymore. We don't need much oxygen anymore, because we're not doing a lot. We're not being so active. And so we're making these distinctions. I keep using the word making, but probably I shouldn't do that, because experiencing distinctions is a huge part of Buddhism. Buddhism is really based on our natural capacity to see differences between one thing and another.