  We use families of circular null geodesics as probes of a family of
microstate geometries, known as $(1,0,n)$ superstrata. These geometries carry a
left-moving momentum wave and the behavior of some of the geodesic probes is
very sensitive to this background wave. The left-moving geodesics behave like
BPS particles and so can be placed in circular orbits anywhere in the geometry
and actually "float" at fixed radius and angle in the three-dimensional "capped
BTZ" geometry. The right-moving geodesics behave like non-BPS particles. We
show that they provide a simple geometric characterization of the black-hole
bound: when the momentum charge of the geometry is below this bound, such
geodesics can be placed anywhere, but exceeding the bound, even by a small
amount, means these geodesics are restricted to the deep interior of the
geometry. We also show that for left-moving string probes, the tidal forces
remain comparable with those of global AdS$_3$. Nevertheless, for some of these
probes, the "bumps" in the geometry induce an oscillatory mass term and we
discuss how this can lead to chaotic scrambling of the state of the string.
