Walk through a maze of mirrors, you'll soon come face to face with yourself.
Your nose meets your nose, your fingertips touch at their phantom twins, stopped abruptly by a boundary of glass.
Now researchers from the City University of New York's Advanced Science Research Center have turned the theory of 'time reflections' into practice, providing the first experimental evidence of its manipulation across the electromagnetic spectrum. A control signal activates a set of switches along a metal strip. The electromagnetic impedance of the metamaterial is abruptly changed, causing a forward-propagating signal to be partially time-reflected , with all its frequencies converted.
Strangely, the 'echo' of altered frequency is also a reversal of the signal. If it was an echo of your voice counting one to ten, you'd hear each number spoken backwards, from ten back to one, in a chipmunk squeak.
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