  Active matter composed of self-propelled particles features a fascinating set
of self-organization phenomena, spanning from motility-induced phase separation
to phototaxis to topological excitations depending on the nature and parameters
of the system. In the present Letter, we consider the formation of micelles
from particles with a broken symmetry having a circular back and a sharpened
nose and moving towards the cusp. As we demonstrate in experiments with robotic
swarms, such particles can either remain in the isotropic phase or form
micelles depending on the location of their center of inertia in accordance
with a recent theoretical proposal [T. Kruglov, A. Borisov, Particles 2021
(2021)]. Crucially, the predicted micellization does not involve any charge
asymmetry, in contrast to that observed in surfactants, and is governed by an
interplay of activity and particle shape asymmetry. This renders the observed
ordering reversible upon switching of the particles' activity and opens the
route towards novel applications in tunable structuring of materials.
