It has no effect on a vast array of electromagnetic waves, which come in a myriad of sizes. The light waves we can see make up only a thin sliver of them.
Although the scientists say the principle behind the cloak could currently only be used to hide objects from the human eye that are so tiny it can't see them anyhow, they say it could "pave the way" to the development of advanced "camouflaging and invisibility."
Microwaves, which the mantle cloak currently does neutralize, are used in radar detectors.
Perhaps the cloak would make a good ingredient in car paint.