[raiph]

I recall Larry saying the key visual aspect is the `\` (I don't recall him mentioning the `/`) because `[\` visually echoes the typical shape of results:

    .say for [\**] 2,3,4

    4                          #           4
    81                         #      3 ** 4
    2417851639229258349412352  # 2 ** 3 ** 4