Horizontal Vowel System

Horizontal Vowel System is a vowel system that was considered on the Vowel Ballot.

Proposal
The Horizontal Vowel System proposal was posed as follows:"Vowels are phonemically distinɡuished only by backness. 3 phonemic vowels: /a ~ i/ ('front'), /ɐ~ə~ɨ/ ('central'), /ɑ ~ ɯ/ ('back'), where [± round] can depend on consonantal environment. No diphthongs."