shot with my LG Viewty cellphone.
edited by me, music by Murcof (Fernando Corona).
Wikipedia:
"In physics, buoyancy is an upward acting force exerted by a fluid, that opposes an object's weight. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. If the object is either less dense than the liquid or is shaped appropriately (as in a boat), the force can keep the object afloat. This can occur only in a reference frame which either has a gravitational field or is accelerating due to a force other than gravity defining a "downward" direction (that is, a non-inertial reference frame).
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