Tuan Nguyen is using a Raspberry Pi to power his 'Dream Weaver' table which draws pictures using a magnet in sand.

As the water-table in permeable sand forms a horizontal or very gently sloping surface, deflation basins within dunefields, and the sand plains at the rear of transgressive dunes or between dune ...

Sand deposition, accretion, and erosion within the coastal environment result in the development of a variety of dune morphologies ... a base level such as water table level or a more consolidated ...