The origin of new shell structure observed in neutron-rich light nuclei and implications for medium-heavy nuclei are discussed in terms of the monopole part of the in-medium NN interaction. The evolution of the harmonic oscillator (HO) closed shells N=8, 20, 40 via shell gap quenching towards Nm-2N, with N numbering HO quanta, is compared to recent experimental data. The locality of the monopole driven shell change and the fading of its shell quenching power beyond N=50 is discussed.
PACS numbers: 21.60.Cs, 21.10.Dr, 27.20.+n, 27.30.+t
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