For me it is the most mysterious violation, because it is anisotropy of space-time. It does not look so weird for Time, because we intuitively accept an “arrow of time”, but as space is the same as time it is weird. In LQG or superstrings, are there any leads which might help to explain that phenomena? In particular, is that asymmetry "per se", or is it a weak “echo” of the Big bang/initial/boundary conditions of our Universe? If so, can it vary in time?