One of the really challenging parts of making this movie is that you never know exactly where the "pixels" are. There's a chance that the head didn't actually get the CO atom. There's also a chance that the atoms bounced around some while moving the atoms.
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How it was made : https://www.youtube.com/watch?v=xA4QWwaweWA
What are the ripples? : https://www.youtube.com/watch?v=bZ6Hv_du2Zo
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Similarly, it never seemed to get much attention, judging by the severe lack of up-votes. Here are the previous submissions I found (some deleted):
https://news.ycombinator.com/item?id=8258631
https://news.ycombinator.com/item?id=7242743
https://news.ycombinator.com/item?id=5648856
https://news.ycombinator.com/item?id=5645372
https://news.ycombinator.com/item?id=5643518
https://news.ycombinator.com/item?id=5642074
https://news.ycombinator.com/item?id=5637191