In Figure , we show the full current density of all three model systems and their two highest occupied MOs. If we only consider their MOs, it is difficult to predict the qualitative shape of the current density in the three systems. In 1, the nodal plane that spans the plane of the molecule is present in the current density, but not the nodal planes between the individual segments of the MOs; in 2, the current density curves away from the bonds even though the MOs have their highest isovalues at the bonds; in 3, the current density flows circularly around each atom while the MOs have a helical shape. Even though a helical nodal plane is seen in both of the highest occupied MOs, no nodal plane can be seen in the current density. This seems to be in direct disagreement with what we see for 1 where the nodal plane of the HOMO and HOMO-1 shows up in the current density.