Rectagular means each rectangular element act onto the others with null-effect. Namely nothing happens. It seems nothing happen. Moving electron induces a magnetic field around it in the rectangular direction so that this newly created magnetic fiels induces moved electron in little distance apart. This infimum distance actually does not exist unless if the electron is not composed of the magnetic field as well.
Nothing jump the space without reason.
Thus, we must conclude that electric field and magnetic field are not completely rectangular, and mass and time are not completely rectangular also. Einstein tried to explain the space with conventional 3 directional space. That was his mistake. This is what Einstein called his Unified Field Theory . Think of the center of the Earth.