Thanks Mike. I think what I'm trying to do is a bit different than that. I'll try to illustrate it using your example... Your example placed two shapes at the origin, but I'd like to place them in a particular orientation relative to each other to build up a sub-detector, say like this: _________ ____ | Big ||sml | | ||____| | | | | |_________| Then I want to take several things that are a combination of Big and sml and arrange them to build up my detector, say like this: ____ _________ _________ ____ | lms|| giB | | Big ||sml | |____|| | | ||____| | | | | | | | | |_________| |_________| _________ _________ | | | | | | | | ____ | | | | ____ | lms|| giB | | Big ||sml | |____||_________| |_________||____| The actual geometry is more complex than this sketch, so I don't want to place each individual shape many times. Instead I'd like to build the sub-detector combination once and place it many times. But I haven't been able to see how I can add a node to a parent node's list, but in different positions. Is this possible? Maybe not and each shape has to be positioned separately each time, but I suspect/hope that it is just that I'm not seeing how to work with node lists effectively. Mike
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