Love orca, and that's a really nice example. Messed with it a bit when it came out, and one toy project I'll share in the hopes that someone does it before me: an orca GUI that uses a larger grid with representative images in place of single char glyphs. I found that writing orca is fairly straightforward — you look up the sheet, find a thing and do it. It's reading that's the hurdle. An 8 char chunk that made perfect sense when I wrote it takes just as many lookups to read later. This probably gets easier over time, but I still think it's a cool design opportunity.