539 00:46:19,640 --&amp;gt; 00:46:26,000 if the light goes out the two arms and comes back at exactly the same time and there's no extra jitter 540 00:46:26,000 --&amp;gt; 00:46:28,160 then that's a classical space time, 541 00:46:28,160 --&amp;gt; 00:46:31,840 but it could be that we'll find a little bit of air or fuzziness 542 00:46:31,840 --&amp;gt; 00:46:36,400 in there and that would be the clue that we live inside a hologram.