Figure 1
A. Chakrabarty et al., Phys. Rev. Lett. (2013)

Boomerangs that don’t return. A trajectory of a boomerang particle in water, starting from the top of the image, with the blue line tracking the point where the arms meet and the red line tracking the “center of hydrodynamic stress,” a point along the axis bisecting the angle of the arms. The boomerang itself is shown in yellow.