The sense of impermanence and danger also featured in her artworks in galleries, such as "Sand/Fans" (1971 and again in 2008), which featured four industrial fans pointed at a central heap of 4000 pounds of sand. In the original 1971 piece the blades of the fan were uncovered, giving a sense of fear to those encountering the work. In the recreation in 2008, the blades were caged. The fans' movement of the sand echoed her interest in nature and science. She initially thought the fans would create a twister of sand in the middle, yet instead they made ripples or waves.