My understanding is that, while at a macroscopic level, my skin may seem like an absolute boundary between my interior and exterior, at a microscopic level, it is full of wholes--we cannot draw a line or arc that represents and absolute boundary between my interior and exterior at a given point in time. I can generalize a skin-boundary for myself, but only in a "fuzzy" way. Are fields of electrical charge and magnetic polarity dissimilar to my body in this way? In other words, is the boundary between a positively charged field and a negatively charged field "fuzzy," or do they never interpenetrate or overlap at a given point in spacetime? If your observational capacity is in the center of a negatively charged field and heads out in a given direction towards a positively charged field, what would passing the threshold between the two field charges be like?