Infinte Dimensions Theory

According to this theory, one dimension is inside another. For example, you take a book. It is a 3D object. You draw a square. Square inside a book is 2D object. And inside this 2D object, a single line is drawn, which is a 1D object. And inside the 1D object, there is a 0D, that means dot. So this means that one dimension is inside another dimension.