Have you seen those videos of those devices where a little marble draws patterns in sand, driven by a magnet? I've never ...

You can happily entertain yourself for hours just watching the steel ball create patterns in ... the ball creates intricate grooves in the top layer of sand until the table is unplugged.

[Mark]’s sand table wisely has a glass top. Most of us have probably seen a video of a sand drawing table at work, in which a steel ball — magnetically-coupled to a gantry under a layer of ...

a kinetic art table that erases whatever pattern it itself creates. The table, which glows, offers a zen-like ambiance with its metal ball gently dragging out patterns in sand. It’s so soothing ...