Its not quite as simple as that. In your version of the allegory I would be reproducing an end product, the bag. To break the allegory for a moment the end product in TG is an image or an animation and for the bag, the image or the animation that would be definitely copyright theft and treated accordingly. Back to the allegory, buy a bag from Louis Vitton, check its pattern
methodology and use it to make your own
original bag. No problem ...
Its the difference between "finished product" and selling a "process". In TG the process of joining nodes together is implicit in the program itself, you can not own it. You can own the images, the animations, the output and although you do of course "own" everything on your computer.
For example who owns this? (below) Me, Planetside, this forum, some other group/person who has put together the nodes in the same way? I "think" I own it (I give it away) but "if" it were the same pattern as one that you produced would you have a case against me ... I don't think it can be answered that easily.

Richard