Consider an Argand diagram that shows the number line (positive and negative) and the imaginary plane of other possibilities. As in, we have numbers that are positive and negative, and through complex numbers all of the polarities in between. I am using this as an analogy, because we have experimentally observed particles and antiparticles; mass with positive and negative charges. Can anybody point me in the direction of work that has theorised the possibility of electrical charges that are neither positive nor negative, but rather values in-between? Either that or perhaps explain why it isn't possible? Conceptually this seems to be a perfect fit with Klein's notion of dimensions wrapped up within our three dimensions.