Overview of our best estimate for the quiet-Sun magnetic energy spectrum E_1D(k), down to the fundamental cut-off at the magnetic diffusion limit (located at a scale of 25 m), where the magnetic field ceases to be frozen-in and decouples from the plasma. The spectral bump due to the collapsed flux tubes just beyond the Hinode resolution limit is surrounded by inertial ranges with −5/3 power law behavior. While the flux tubes and the flux at larger scales are oriented preferentially in the vertical direction, the field below the flux tube scale range will have a much wider and randomized angular distribution. These small scales contain the “hidden” flux that was revealed by the Hanle effect three decades ago.