I successfully did a 

#declare thing = difference 
{
	union { object list 1 } 
	superellipsoid 
}

	but

#declare another_thing = difference 
{
	union { object list 1 } 
	union { object list 2 }
	superellipsoid 
}

	informs me that a patch object is not permitted and does not render
another_thing. 

	A little trial and error should solve the general problem. Am I correct
in guessing a patch object is an old name for a CSG object? 

-- 
Life's too short and death's too long
to take this all that seriously. 
	-- The Iron Webmaster, 372

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