In his parable, prisoners are chained in a cave and only perceive the world as shadows on the wall.
But normally, save for the odd urban explorer or raver illegally slipping onto the tracks for a nose around or a dance, this eerie world of shadows and ghosts has been all but forgotten.
However, its problems began when sharp-eyed players noticed that the fifteen years it had taken to develop had apparently not left enough time to create backgrounds, which had been lifted from The Elder Scrolls: Oblivion, World of Warcraft, Thief: Deadly Shadows and elsewhere.
But Dr Anders Sandberg, James Martin Research Fellow at the Future of Humanity Institute at Oxford University, said that while "the future looks pretty bright" there are "dark shadows" because technologies to improve the world also bring fears such as security worries over advances in sharing technology and bio-weapons coming out of bio-technology meant to feed us and bring us new sources of energy.
Someone is behind the shadows, drawing the threads which destroy the world.
But the rest of the world needs to pay more attention to this conflict in the shadows.
He saw mountains casting shadows on the moon and realised this body was a world, like the Earth, endowed with complicated terrain.
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Since the ban, the bugs have boomed, emerging from the shadows to prey on the warm bodies of unsuspecting travellers across the world.
The bid document said Hull was "finding its place in the UK, a city coming out of the shadows and re-establishing its reputation as a gateway that welcomes the world".
What frightens her is the possibility that we will become so immobilised by dreams and shadows, so free of pain, mentally standardised by the cyber-world that is our principal habitat and rendered oblivious by chemicals, that we will have lost the ability to choose.
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