Shakespeare's standard poetic form was blank verse, composed in iambic pentameter. In practice, this meant that his verse was usually unrhymed and consisted of ten syllables to a line, spoken with a stress on every second syllable. The blank verse of his early plays is quite different from that of his later ones. It is often beautiful, but its sentences tend to start, pause, and finish at the end of lines, with the risk of monotony. Once Shakespeare mastered traditional blank verse, he began to interrupt and vary its flow. This technique releases the new power and flexibility of the poetry in plays such as "Julius Caesar" and "Hamlet". Shakespeare uses it, for example, to convey the turmoil in Hamlet's mind: