I'm wondering how to cut a transparent hole in something.

Say I have a rectangle and I want to make part of it transparent so 
that I cn see what's behind it. 
Drawing a transparent rectangle on top of it won't workm because it'll 
just reveal the original rectangle.
The only way I cn see it to draw the original rectangle in pieces, 
careful avoiding the area I want to make transparent.  (that may be 
tricky if the transparent area is, say, a circle).

Is there some convenient operation in Pict that can accomplish this 
more directly?  Kind of the union and intersection and complementation 
on constructive solid geometry, but now 2D. 

My guess is no.  I haven't found it.  So I ask.

Maybe I'll need some other drawing tool than Pict.  Suggestions welcome.

-- hendrik

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