The strenght of a tide is related to the difference in the distance
of two points to the center of gravity (the moon). On land the tidal
stresses are just as great as in water but there is less deformation
because the tectonics plates are not so easily bent. Water on the ot-
her hand can have a huge difference in its distance to the moon from
one side to the other. This is especially true for bodies of water
that lay out on an east/ west axis since the moon is in the same plane
as the Earth's orbit.

Lake Ontario is a good example of this and should show a good tide level
at both ends. Lake Michigan is on a N/ S axis so despite its greater
size and capacity there is much less of a tide. (it is more suseptable
to pressure differentials however).

The amount of tidal forces and even bouyancy from air pressure on a large
stone are quite negligible.

These forces would be extremely tiny in a bottle of wine but there are
much stranger things in the world than what Clem Ciamarra suggests so I
wouldn't argue the point without more information. Those who are dubious
might consider that the forces causing the particals to fall out of sus-
pension are also exceedingly tiny.

Why isn't a centrifuge used? Surely it would work.

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Man fears the pyramid, time fears man.