The Euclidean Space is an extremely useful human invention. It is a composite of n number lines. n is called the dimension of the space. The Euclidean Spaces most familiar to the majority of people have n = 0, 1, 2, 3. When n = 0, it is a point; when n = 1, it is a line; when n = 2, it is a plane; and when n = 3, it is 3-dimensional space as represented in figure 7.7. As a result of being a composite of number lines, the Euclidean Space is also packaged using only these seven universal concepts: containership, identity, force, motion, change, grouping/interaction and equilibrium.