I don't know you ever seen this font or this trick or not, but I've never seen this before in a Latin typeface.
All letters are uppercase in this picture and the glyphs change automatically. I mean, we have this for Persian typefaces. Isolated converts to initial and final becomes medial as you type, but I don't think I have seen this in a Latin typeface. (Because there is no initial, medial, final and isolated forms in Latin and uppercase letters are usually just come at the beginning of the sentences.) I think it is a very good effect especially when you type something like: "Success", "Beep", "Food", "Tall",...
You can try this yourself: https://www.boldmonday.com/typeface/macula/
P.S: Some of the designers have done this trick before, but not in an OpenType way, they would design different uppercase and lowercase letters and you have to type that manually.
Have you ever seen a typeface like this before? What do you think about the trick? I like the typeface, very much, btw.