Never heard of Kap before, I find the use of APL symbols and left to right parsing very difficult to read, my brain immediately starts reading right to left when I see APL symbols. I think Kap kills a lot of the elegance of APL as well but maybe I will feel better about it after I get a bit further along in APL, just started learning it a couple weeks ago and at my level of APL, Kap is very confusing to read.