I can think of two ways this could have been done
Either you can put portals anywhere, in order to rotate the blocks, or you have to assemble them in freefall, both would have worked fine.
I found this comic omaketheater.com/comic/9/ by clicking the advert on the page, and this one was alright.
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gaijintendo Regular Member, Mon 2 May 2011, 15:41,
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