Materials: plexiglas, water, sand
This video begins with the calm surface of two elements, water and sand.
The water is converted to a vortex, which is luring the sand that gradually builds up to meet with the water. A sort of spinning hourglass is formed, in which the two materials are fighting each other.
The machine turns off and the water gradually calms, leaving under its surface a stable pyramid out of sand.
Prmd (arnlfn) is part of the research on rotation, spiral and the vortex phenomenon that was conducted during 2010-2012