- Space that is not weird - Straight line is *always* the shortest path - Other forms of space are [[Hyberbolic Space]] and [[Spherical Space]] - Origin is the *point of reference* ([[Point]]) - There is nothing wrong with increasing dimensions to above 3, even if there is no / little spacial intuition. $\huge \mathbb{R}^2$ : 2D Euclidean Space $\to (P_x,P_y)$ $\huge \mathbb{R}^3$ : 3D Euclidean Space $\to (P_x,P_y,P_z)$