I once found myself implementing Ulam's spiral in J, and was so taken by the (one) line of code it required, that I made a video about it: https://www.youtube.c

I once found myself implementing Ulam's spiral in J, and was so taken by the (one) line of code it required, that I made a video about it: https://www.youtube.com/watch?v=dBC5vnwf6Zw https://www.youtube.com/watch?v=dBC5vnwf6Zw