The Lune is also known as the American Haiku and was first created by the poet Robert Kelly. It is a 13-syllable, self-contained poem that has 5 syllables in the first line, 3 syllables in the second line and 5 syllable in the final line. 5/3/5
Unlike haiku, there are no other rules. While there are less syllables to use, this form has a little more freedom.
There is a variant Lune created by poet Jack Collom. His form is also a self-contained three line stanza but his poem is word-based (not syllable-based) and has the structure of 3 words in the first line, 5 words in the second line and 3 words in the final line.
This is the Collom Lune.
roots of evil
by account of the ground
life too short