---

1. Chapter 1 mostly talks about envisioning multiple dimensions, from the second and third dimension to the fourth, fifth, sixth and beyond. However, what about no, or 0 dimension? Is it just a point?
2. In B3D, there is an illustration(page 9) that shows the progression of the hypercube from 0 dimension to the fourth dimension. What happens if you take a equilateral/equiangular triangle and project it into the third dimension? Is it a triangular pyramid? What happens when the pyramid is projected into four space? How many vertices and sides does a four space triangle have?
3. "Dimension" is a multifaceted word. But, mathematically, is there only one possible fourth dimension? Or, are there other possibilities?