  The yrast states of even even vibrational and transitional nuclei are
interpreted as a rotating condensate of interacting d-bosons. The corresponding
semi-classical tidal wave concept is used for microscopic calculations of
energies and E2 transition probabilities. The strong octupole correlations in
the light rare earth and actinide nuclides are interpreted as rotation-induced
condensation of interacting f-bosons.
