A Mountain of Sand, Blown Away: 1,500 people bring to a gallery two liter bottles (or 3,000 people bring one liter bottles) and climb a ladder to funnel the sand into a mountain of sand. 3,000,000 cubic centimeters of sand will pile on the floor. A single pedestal fan aimed at the sand plows it in a pattern across the floor for the duration of the exhibit.
Each participant pays a certain amount which is collected for the Widows of Iraq.
There is now 3 tons of sand on the gallery floor. Therefore a contractor or volunteers be to be prearranged to dispose of the sand.
Another way to do this is on a beach where the sand can remain. A fan may or may not be required.