Hi Dan!

It's because there are more than one unions in the object{} statement.
That means there are too many - more than one - objects in the
object-statement.
The #while statement in your Grid#macro genereates several unions.
You may make a union of those grid-generated unions:

change
 object {Grid(<2,2,2>,1,.1) pigment{Green}}
to
 object {union { Grid(<2,2,2>,1,.1) }pigment{Green}}

But then you don't need the object-statement. You can just type:
 union { Grid(<2,2,2>,1,.1) }pigment{Green}

cukk

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