  A crucial step in wine tasting is the so called swirling, necessary to
release the bouquet of the wine: a gentle circular movement of the glass
generates a wave propagating along the glass walls, enhancing oxygenation and
mixing. Although being used in a large variety of other applications (e.g.
cells cultures in orbital shaken bioreactors) this motion is not yet well
understood. In this fluid dynamics video we show the large variety of waves
shapes generated by this simple movement, and we identify a group of
dimensionless parameters governing the flow.
