This
conclusion can easily be demonstrated with a bag of marbles. If the
marbles are all the same size and they are brought together to the
limits of their rejectivity, no more than twelve can be packed around
the central marble.
It
might be thought that were a graviton to be adjacent to a complex
object,
say a photon, the number of gravitons to which it could be simultaneously
adjacent would be reduced. However, the complex object is itself made
out of gravitons and there is no sensible reason why a graviton inside a
complex object cannot be adjacent to a graviton outside the object - so the
conclusion stands.