From the point of view of each fly standing on the beef bladder being inflated by the headman's wife, it is standing still and all the other flies are moving away from it.
Now imagine a rocket which from your point of view is very close to the edge of AQUENUS and is flying towards the edge of AQUENUS at a speed close to speed c.
In this case, the rocket is moving away from you at the total speed of:
rocket's motion in AQUENUS at speed almost c + AQUENUS' expansion at SPEED-C =
Now both headman's sons are kayaking together on the flowing river. And now the kayak has a speed greater than what it would have if the water were still.
That's why the rocket disappeared just now from your imagination and simultaneously appeared "on the other side of the mirror," that's where your human imagination cannot reach.
Pic.31
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