Moving Sand Art Pictures clear liquid with black sand, four types of white sands and a fine blue glitter. The double strength glass is framed with a quality knotty alder wood frame. Air bubbles hold up the sand creating unique scenes with every turn, pictures may take from just minutes to many hours to finish a scene. The black sand is heavier than the white sands so the sands will never mix. Some of the sands are transparent and some opaque giving the pictures a 3-D effect.