An irregular ode is an ode that does not follow a fixed stanza pattern or a regular rhyme scheme. Instead of repeating the same line lengths and rhyme arrangement throughout, it moves freely from one stanza shape to another, often to match the poem's changing feelings or ideas.
Writers use the irregular form when they want the praise, reflection, or emotional movement of an ode without the strict structure of a Pindaric or Horatian pattern.
Example
Morning opens the window.
A sparrow strikes one bright note,
and the garden answers.
By noon the air is heavier;
I praise the shade that keeps me
and the cup of water on the sill.
Evening, with its long blue hand,
turns the day gently over.