Found in Hawaii, Iceland, the Canary Islands and other destinations around the world, black sand beaches intrigue ... and consider a stay in a thatched-roof bungalow at Johnny's Place Hotel.

It’s charged with moving a small magnet to drag a ball bearing through the sand to draw patterns under the command of G-code generated with the Sandify tool.

Last year, Green and his colleagues identified two chemicals that behave as activator and inhibitor, giving rise to the regularly spaced ridges found in the roof ... patterns out of them,” said Green, ...

Sand deposition, accretion ... elliptical dunes overlapping each other in an imbricate fashion (stacked like roof tiles). They develop in a range of situations including wetter areas, and/or ...