Geometry class, but make it Saturn.

Each week, Mansion Global tackles a topic with an elite group of designers from around the world who work on luxury properties. This week we look at how to use geometric shapes in your home’s decor.

From Death Valley to Chile to Iran, similarly sized polygons of salt form in playas all over the world — and subterranean fluid flows might be the key to solving the long-standing puzzle of why.

Tile patterns in which the same shape is laid out without gaps can be seen on castle walls and chess boards in artificial objects, and in insect compound eyes and beehives in biology. Square tiles are ...