0087 Let me say that again, with diagrams.

The thermodynamic nested form looks like this.

0088 The homeodynamic level “constrains” the thermodynamic level through a contragrade arrangement.  The contragrade arrangement may be regarded as “downward causation”, because it transforms the orthograde reaction in such a manner that some of the orthograde free energy is channeled into an electric current.  The fact that the contragrade arrangement does not go haywire serves as a testimony to its homeostatic capabilities.  It can hold itself together, even though it is theoretically siphoning energy from an explosion.

Here is the homeodynamic level.

0089 One of the beauties of this diagram is that is keeps the thermodynamic level pristine, even though the reader knows that the explosion is separated into two reactions, one giving electrons and one receiving electrons, in a fairly complicated manner.  All the complexity is packed into the potential of the contragrade arrangement_1b.

I suppose that_1b is where the complexity belongs, because so many features of a hydrogen fuel cell can go wrong.  Engineers try to isolate and control situational potential_1b.

0090 The morphodynamic level capitalizes on the homeodynamic level, by providing an outlet that dissipates the re-directed energy.  In this example, the fuel cell powers a small motor.