More ideas from eva
A flapping object moves through a fluid forming many patterns of vortices in its wake.

symmetric foil flaps in a vertical soap film; as the amplitude and frequency of the oscillation varies, the wake patterns it produces change dramatically.

Soap films can create remarkable flow visualizations when...

Soap films can create remarkable flow visualizations when illuminated with monochromatic (single color) light. Each of the photos above shows a flow moving from left to right with a small object near.