The three chapters here for topology are shape manifolds dimensions. This is so good because this also plays into like, you know, psychologically speaking or neurologically speaking as a brain develops. One of the first things that happens is we bring into focus shapes and then also the retina receives information from the outside world in two dimensions. Even though the retina is a three dimensional object, the image that is delivered into consciousness that is extracted from light is two-dimensional. And so it's already a virtual concept. It's already an abstraction, even the level of the third dimension. Like people who have had and have lost their vision at an early age and they gain it later through surgery or through