  In recent laboratory studies the robustness of a bouncing barrier in
planetesimal formation was studied with an ensemble of preformed compact
mm-sized aggregates. Here we show that a bouncing barrier indeed evolves
self-consistently by hit-and-stick from an ensemble of smaller dust aggregates.
In addition, we feed small aggregates to an ensemble of larger bouncing
aggregates. The stickiness temporarily increases, but the final number of
aggregates still bouncing remains the same. However, feeding on the small
particle supply, the size of the bouncing aggregates increases. This suggests
that in the presence of a dust reservoir aggregates grow into but also out of a
bouncing barrier at larger size.
