  We present a detail study of dynamically generating a M2 brane from
super-gravitons (or D0 branes) in a pp-wave background possessing maximal
spacetime SUSY. We have three kinds of dynamical solutions depending on the
excess energy which appears as an order parameter signalling a critical
phenomenon about the solutions. As the excess energy is below a critical value,
we have two branches of the solution, one can have its size zero while the
other cannot for each given excess energy. However there can be an instanton
tunnelling between the two. Once the excess energy is above the critical value,
we have a single solution whose dynamical behavior is basically independent of
the background chosen and whose size can be zero at some instant. A by product
of this study is that the size of particles or extended objects can grow once
there is a non-zero excess energy even without the presence of a background
flux, therefore lending support to the spacetime uncertainty principle.
