More is different

at each new level of complexity, entirely new properties appear, and the understanding of this behavior requires research which I think is as fundamental in its nature as any other

Philip W. Anderson 1972

Si-crystal

semiconductor

MgB2 superconductor

NaxCoO2 superconductor

La2-xSrxCuO4 superconductor

DNA giant molecule

1 atom

2 atoms 3 atoms 4 atoms many atoms