Space-time localization diagrams ``unlock"
subtle aspects of $\nu$ oscillations such as coherence, entanglement, etc. Observability of propagation decoherence in oscillating neutrino state is discussed.
The sizes of WPs of reactor and source neutrinos are estimated and it is shown that
damping effect due to decoherence is negligible. Among topics of interest are transition from microscopic to macroscopic description of matter effects, oscillations in non-linear generalization of Quantum Mechanics, influence of complex structure
of vacuum, in particular, possible presence of cosmic strings and domain walls on oscillations,
neutrino oscillations driven by the effective neutrino masses generated via refraction on very light dark matter particles.