  Einstein's 1905 analysis of the Brownian Motion of a pollen grain in a water
droplet as due to statistical variations in the collisions of water molecules
with the grain, followed up by Perrin's experiments, provided one of the most
convincing demonstrations of the reality of atoms. But in 1926 Schroedinger
replaced classical particles by wavefunctions, which cannot undergo collisions.
Can a Schroedingerist wavefunction physics account for Perrin's observations?
As systems confined to a finite box can only generate quasiperiodic signals,
this seems impossible, but I argue here that the issue is more subtle. I then
introduce several models of the droplet-plus-grain; unfortunately, no explicit
solutions are available (related is the remarkable fact that the harmonics of a
general right triangle are still unknown). But from generic features of the
models I conclude that: (a) wavefunction models may generate trajectories
resembling those of a stochastic process; (b) diffusive behavior may appear for
a restricted time interval; and (c) additional ``Wave Function Energy", by
restricting ``cat" formation, can render the observations more ``classical".
But completing the Einstein program of linking diffusion to viscosity and
temperature in wavefunction models is still challenging.
