Arthur C. Clarke
I sadly see an arms race brewing:
TECHNOLOGY REVIEW: Today, Lu Lan at Zhejiang University in China and a few pals have actually created the first invisibility cloak designed using topology optimization. They carved it out of Teflon and it took them all of 15 minutes using a computer-controlled engraving machine. “The fabrication process of a sample is substantially simplified,” they say.
The resulting “Teflon eyelid” invisibility cloak hides a cylindrical disc of metal the size of poker chip from microwaves. But crucially, its performance closely matches the prediction of the computer simulation.
Experimentally demonstrated an unidirectional electromagnetic cloak designed by topology optimization
Pro and Con, i.e. before I get too excited, I'd like to hedge my bets!