The visualization of an object moving at speeds around the speed of sound. The object (red point) has a position $x(t),y(t)$ and is emmiting sound at frequency freq, which is shown as cicles with growing radii.

Circles (wavefronts are drawn with small opacity, this the darker places correspond to places where more wavefronts meet and resulting sound amplitude is larger.

One can interact with time, the speed of motion and choose the tracjectory.