So Loop Quantum Gravity predicts a "spinfoam" which goes from one quantum "spin network" state to another in the fashion of a path integral. And each spin network describes the properties of spacetime and is the eigenstate of the QG Hamiltonion. OK. But by what process is the spin network actually measured? What "interaction" causes the superposition of spin networks to "colapse" to a particular spin network eigenstate? I have to wonder if such a measurement process can even exist at that level. Since every region of space is always in contact with its neighboring regions in the same way (measurement or not), what special event could cause one region to collapse in a "measurement"? And if it does not collapse, then could it be that by definition spacetime must always be assumed to be in a superposition? And what would be the implications of that? If there is no measurement process to get the spinfoam wave function to collapse to an eigenstate spin network, then it would seem that we have achieved a realm of unpredictibility/unmeasureability again. Is this right?