Sonnet 83 picks up on the notion, introduced in Sonnet 82, of a 'gross painting' in words that other poets make of the young man with the 'strained touches' that rhetoric can lend them, in stark contrast to Shakespeare's own 'plain true words'. But rather than forming a contained pair with Sonnet 82, it spins the argument further, now giving his reasons for not doing what other poets pursue, namely the fanciful portrayal of the young man in the most elaborate and fashionable language available at the time.
Shakespeare then continues to build on this for another two sonnets, to effectively create a group within a group that follows one continuous thread right through to and including Sonnet 85, before he then ends the Rival Poet sequence on an astonishing flourish with Sonnet 86.
