  Microscopic gyrators, including Brownian gyrators (BGs), require anisotropic
fluctuations to perform gyration. It produces a finite current, driving the
system out of equilibrium. In a typical BG set-up with an isotropic colloidal
particle, the anisotropy sets in by the coupling among space dimensions via an
externally applied anisotropic potential confining the particle and the
difference between the temperatures along various space dimensions. The
coupling is conservative. Here, contrary to a typical BG, first we consider an
over-damped, anisotropic colloidal particle (a Brownian ellipsoid), trapped in
an isotropic harmonic potential in two dimensions (2D). The space dimensions
are coupled by the difference between the longitudinal and transverse
frictional drags experienced by the ellipsoid, together with a finite tilt in
its orientation due to its chirality. The coupling is dissipative. They are
intrinsic properties of the particle. We have shown that this dissipative
coupling can generate enough anisotropic fluctuations to perform a steady-state
gyration in the Brownian scale. Next, going beyond BG, we have considered an
inertial, granular, chiral ellipsoid in 2D, subjected to athermal, anisotropic
fluctuations. There is no trapping force confining the granular ellipsoid.
However, the coupling between the velocity components of the granular ellipsoid
is still dissipative. We have shown that being assisted by the dissipative
coupling and the anisotropic fluctuations, the inertial, granular ellipsoid can
also perform gyration in 2D. We have also shown that the dominant contribution
towards the gyrating frequency can be attributed to the Coriolis force acting
on the granular ellipsoid. Hence, the gyrator in the granular scale is also a
tiny autonomous machine that generates a directed motion (gyration) from
fluctuations. Although there are fundamental differences between the two.
