> Another promising avenue relies on metasurfaces—thin sheets made up of an array of tiny reflective elements that can be electronically adjusted to change how

> Another promising avenue relies on metasurfaces—thin sheets made up of an array of tiny reflective elements that can be electronically adjusted to change how a signal bounces off them. Sounds a bit like phased array radar. https://en.wikipedia.org/wiki/Phased_array https://en.wikipedia.org/wiki/Phased_array