how then could anything have mass if everything is made up of particles? You say we can't experience anything that isn't 3d, yet ask for an example of something that has only 2. Anything without depth has only 2 dimensions. A still image of anything with depth will seem like there was distance from the primary observers vantage point to the furthest away from him in it, but there is no space between postsecondary frame of references, meaning only the primary observer could have seen actual spatiality. if an atom extends so far in actual dimensions, can't we say unlike lines, its scope cannot be comprised of infinite points? For example, if a marble represented all the particles that an atom is comprised of, since something that gives everything mass must have mass itself, and the distance between your thumb and index represented the distance of a line segment that math says has infinite points in between, then why can your fingers only squeeze it so hard? Is it because massless pointlike particles are imaginary?