Elevator "Thought Experiments"; Gravitational Red Shift, Light Bending.

电梯思想实验，重力红移，光弯曲。

youdao

In "Rodeo -- New York City" Robert Frank pictures a thin cowboy bending his head to light his cigarette.

VOA: special.2009.03.23

And so will the fortunes of those who get in early and build the right light-bending products.

FORBES: Hooked on photonics

The content zooms and clatters over an array of archaic and futuristic gear, from aging copper phone lines to light-bending optical switches.

FORBES: Weaving The Perfect Net

But researchers quickly found out that the mathematics behind bending these light waves, called transformation optics, could also be applied to sound waves.

BBC: Acoustic 'cloaking device' shields objects from sound