In this workshop we will show an n-regular polygon torus and its applications where n=4, 8 using 4D Frame. We will bring the 4D Frame for participants to use. As n approaches infinity, an n-regular polygon torus approaches to a circle–torus. Participants can make an 8-regular polygon torus (i.e. octagon-torus) by the Pythagoras theorem using 4D Frameⁱ, consisting of 16 regular octagons. Therefore people will understand the simple mathematical structure and its spatial beauty in their work.