A close acquaintance with electricity begins with charges and currents, but we will never know its real face, we will find it experting forces, as molecules of a fluid (Coulomb), still in the field (Maxwell), in light waves, in mathematical equations, intangible, hidden behind of mathematical concepts, still behind the description of space and time, in quantum fields (Feynmann), is located at the crossroads of the great paths of physics, between quantum mechanics and relativity.