They can be seen as some kind of lettering machines programed to take advantage of swashes (specially at the beginning and and at the end of text lines) and to avoid stroke collisions. Because of the Contextual Alternates feature, the letters will change while you’re writing. Just use any OpenType-compatible software, keep this feature activated and the font’s algorithm will do the rest. In Capellina Script and Capellina Rough you can also use the stylistic alternates / stylistic sets feature if you want to explore some extra letterforms.