  Oscillons, extremely long-lived localized oscillations of a scalar field, are
shown to be produced by evolving domain wall networks in quartic theory in two
spatial dimensions. We study the oscillons in frequency space using the
classical spectral function at zero momentum, and obtain approximate
information of their velocity distribution. In order to gain some insight onto
the dilute oscillon 'gas' produced by the domain walls, we prepare a denser gas
by filling the simulation volume with oscillons boosted in random directions.
We finish the study by revisiting collisions between oscillons and between an
oscillon and a domain wall, showing that in the latter case they can pass
straight through with minimal distortion.
