by metlslime » Sat Mar 27, 2010 7:24 am 
			
			Actually it's more complicated than that...
In the original compilers, it was possible to get "CONTENTS_SKY" if you surrounded the sky brush with solid brushes.  In otherwords, it would be solid if it touched the void, otherwise sky.
Later compilers added the feature of turning even void-touching skies into CONTENTS_SKY...
you know, based on my memory of 13 years ago.