Indifferent to this decoherence einselection, the Diósi-Penrose collapse necessarily implies that position should be the preferred basis. However, how should the collapse be in systems where the superposition is not expressed on a position basis? Consider, for example, superconducting quantum interference devices (SQUIDS), which show superpositions of clockwise and counter-clockwise flux in the device loop. In such a case, the gravitational self-energy is null, and collapse, according to the Diósi-Penrose model, would never occur.