Read a review article
on diluted surface potentials for nematic liquid crystals and 2D-vesicles (compressed PostScript file, 750 kB)
Watch an animation (about 250-400 kB each) of
an elongated convex vesicle first becoming non-convex and then evolving towards a circle,
a vesicle in free fall, reaching its equilibrium shape after a transient instable shape,
a vesicle getting trapped by a wall,
the same vesicle detaching under the influence of gravity.