Flow Snapshots ♦ Flow past an airfoil at high angle of attack shortly after a sudden start of motion. A marginal separation near the leading edge is followed by reattachment. The starting vortex is clearly seen. ♦ Flow past the same airfoil at a later time. There is a substantial region of separation. ♦ And even later. ♦ This is an early stage of the development of the Karman vortex street behind a circular cylinder. ♦ Flow past a car. ♦ This is a spatially developing Karman vortex street: further downstream the vortices will gradually arrange themselves into the usual mutual position.