Did Knuth touch on the ability to morph between different designs of a font, or was it simply the ability to do fonts as sets of curves so that they could be re

Did Knuth touch on the ability to morph between different designs of a font, or was it simply the ability to do fonts as sets of curves so that they could be resized? Edit: never mind, I looked up the original paper and find a good description in just the first paragraph. He definitely had variations of the letters in mind.