Exactly What Is Vowel Harmony?

Every single vowel has a feature assigned to it. You can define all the vowels in a system using these features. Some vowels will have one of these features kind of blank, and they will need to get that feature from another vowel. So for example, if you could have something that was a high vowel that was coming in an affix suffix, let's say, and if it was coming after an ooh, it would take its round feature from that ooh,. Whereas if it was like following an e-val, it might take its minusround feature from that and come out as a plus high minus round plus ATR plus back vowel.