Describe PerpetualSystem here.

The reference is to the theory of the perpetual engine.  Such an engine would produce enough fuel simply by operating it, to continue to run indefinitely.  
A system that had such capabilities would adjust, modify and enhance itself without intervention...it would learn and respond to it's environment.  Would 
this be cool to devise or what?  (1995)

--BillMeecham

You have described the universe - look up at night and you will see how cool it was and is. It has been devised and is working. 
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The universe is in a unique position here: if you define time as being contained by it, then it is tautologically perpetual.  If you don't it is not at all clear that it is perpetual....

He/she probably meant the universe as we perceive it when viewed from the planet earth and where he/she is at the time. He/she was not looking at it  from a time machine or from 15 dimension space, or a math background.
He/she probably would have to look up "tautological" since it is not common usage for those who view the stars as the universe. Why confuse the issue?
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