Positive Feature is a handmade, layered font. All layers come with contextual alternates, which means you have 4 different versions of each lowercase letter to play around with.
What's cool about the two layer versions is that they mix in a lovely way! Try typing your text with layer 1, copy/paste layer 2 on top in a different color - perhaps even alter the transparency a bit...and all of a sudden a nice effect sees the light of day!