This sort of build makes an arch-y shape that can expand. Of course, trying to find the perfect angle to make them connect is hard, because once it's built, it's difficult to change the angle. To change one you essentially have to change all at the same time, and it made me cross-eyed trying to get it to work. But finally it did, as demonstrated in the top one. The bottom just shows a different angle, but I'm not sure that it could be connected into a circle at that angle. I've only ever managed to get the one circle finished; all the rest of my tries ended up in wreckage of the lego kind.
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