also duplicated at: https://news.ycombinator.com/item?id=33971341 https://news.ycombinator.com/item?id=33971341 There must be a trick to it, but some of it has

also duplicated at: https://news.ycombinator.com/item?id=33971341 https://news.ycombinator.com/item?id=33971341 There must be a trick to it, but some of it has to be real... and it's so smoothly done I can't easily see the transition.