[pstricks] morphing from a square to a circle over 10 steps

[mathias legrand]

Hello,

is it possible to create with pstricks 10 shapes that continuously go 
from a square
to a circle with pstricks ? I think it possible to achieve such a thing 
with psbezier curves
(at leas approximately) but maybe there is a simple way. (Asymptote does 
is by discretizing
the two shapes (initial and final) with the smae number of segments).

Thanks