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In practice, the device would need two transparent walls to act as the tunnel, or space-time cloak. As an object enters the cloak to perform its action, the rear wall would compress light waves passing through from a source behind. Once the object completes its action and leaves the cloak, however, the front wall would stretch the light waves passing through so that they would merge seamlessly with those outside, whose profile had not been altered.
...All of this, however, relies on someone being able to make the device – and in particular the walls that compress or stretch light waves. McCall admits a perfect implementation "is certainly beyond current technology"...