Now you see it. Now you don't!

Scientists have created a working cloaking device that not only takes advantage of one of nature's most bizarre phenomenon, but also boasts unique features; it has an 'on and off' switch and is best used underwater.

[video=youtube;3YO4TTpYg7g]https://www.youtube.com/watch?v=3YO4TTpYg7g[/video]