There is no "thing" there... I want to get myself clear on sometihng fundamental, so please correct any of my thinking. As I understand it, an electron is a "point particle", and has no volume, ie, it occupies no space. there is no "thing" there - the "particle" is really nothing more than an expression of the EM(?) field. is that correct? Further, protons and neutrons are made up of quarks, which are also point particles. thus, ultimately, even for protons and neutrons, there is really no thing there either. quarks are some manifestation of some other field - is that correct? Photons are pure energy, they are an expression of the EM field. there is no "thing" there either. I assume that the remainder of bosons and leptons which make up the standard model are also entities made from point particles or pur energy of some type, such that there is no "thing" there either. is that correct? so, based on those comments, should every "thing" in the universe actually be thought of only as expressions of fields or the interaction of fields, rather than as actual physical objects ("things")? thanks.