Both are hourglasses that use the kinetic energy of falling sand to power a light bulb. One model is a sort of torch/flashlight-type situation, and the other is a flippable stool.

Experience the soothing and mesmerizing sound of scraping through soft, light green sand in this satisfying video. Watch as smooth layers peel away, revealing delicate textures and captivating ...

Immerse yourself in the soothing sight of light green kinetic sand being effortlessly sliced and shaped with a knife, creating crisp edges and mesmerizing textures. Each satisfying cut reveals ...