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				Strategia_In_Ultima said: 
.....Is it me or am I the only one who cannot picture Dogscoff's "coin"?    
			
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 Take a ringworld.  Shrink it down so that it surrounds the asteroid Ceres instead of a star.
Now build walls over the flat, open spaces.
What you now have, resembes a giant, hollowed-out coin, with the remains of ceres inside.