* Shift: This is a general term for any change in a poem, be it in tone, theme, imagery, or structure.
* Turn: This refers to a specific point in a poem where the direction or focus changes. It's often used in sonnets, where the turn occurs at the volta (the shift between the octave and the sestet).
* Reversal: This describes a shift in the direction of the poem, often from a positive to negative sentiment or vice versa.
* Break: This can refer to a change in stanza, line length, or rhythm.
* Modulation: This term is used for a gradual shift in the poem's tone or mood.
* Contrast: This describes a change in the poem's focus, often by introducing a contrasting idea or image.
To give you a more precise answer, I need more context. What kind of change are you interested in?
For example:
* Change in tone?
* Change in theme?
* Change in structure?
* Change in imagery?
Once you tell me what kind of change you're looking for, I can provide you with the most appropriate literary term.