... granular compaction. The model [34, 35] is based on the following picture. Consider a box of sand in the presence of gravity in the jamming limit. Adopting, as in the previous chap-ter, a lattice-based ... behaviour of the top of a column of grains in the jamming limit, alluding to an increasingly slowerdynamics as we get to frozen grains at its bottom. In reality, of course, near the middle of the ... reconciliation between, on the one hand, the intuitive perception that not all microscopic configurations canbe equally visited during compaction in the jamming limit, that the most compactconfigurations...