The line about the optical illusion of the legs moving due to the background colour reminds me of this recent HN post: https://news.ycombinator.com/item?id=3455

The line about the optical illusion of the legs moving due to the background colour reminds me of this recent HN post: https://news.ycombinator.com/item?id=34553705 https://news.ycombinator.com/item?id=34553705