Many electric bass players discovered the instrument as a result of first playing either acoustic bass or guitar. Interesting that the conception of the E bass fingerboard more resembles the thought process of the guitar than upright; that is to say, the acoustic bass requires a linear conception of ‘positions’ due to it’s shear size. On the acoustic, I don’t think of ’boxes’ until 4th or 5th position. On electric, I think ’boxes’ right a the nut. I have given electric lessons to fabulous upright players who had know idea of the movable box (or stretching in and out of a box). Interesting!