That bit of trickery works because the light can be manipulated when the material is shaped with features about as big as the light's wavelength - less than a millionth of a metre for light that we can see.

BBC: Invisibility cloaking benefits from crystal-clear idea

This is boiled and kneaded as it cools, after which the material is ready to be shaped.

CNN: Some Downsizing Works

Although the images did not directly show water, they showed bright deposits running several hundred meters, seemingly left by material carried downhill inside the crater by running water, occasionally snaking around obstacles and leaving finger-shaped marks diverting from the main flow.

CNN: Life on Mars?