"The 21st century has seen a strong resurgence of the sonnet form, as there are many sonnets now appearing in print and on the Internet."The form consists of three quatrains and a couplet. The couplet generally introduced an unexpected sharp thematic or imagistic "turn" called a volta. The usual rhyme scheme was a-b-a-b, c-d-c-d, e-f-e-f, g-g. In addition, sonnets are written in iambic pentameter, meaning that there are 10 syllables per line, and that every other syllable is naturally accented.