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: .

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