any theme,any three liner eg haiku,senryu,kimo,or any tristich etc eg epigram,epitaph,rhyme the three liners maybe sequenced to a max of 12 lines.Usual PS standard rules.
Note
Haiku that have a caesura and show but dont tell always hit the spot with me and rhyme is acceptable to me ,as is a certain amount of enigma.
Senryu came be amusing and have a wider life based theme than haiku.
Tristich where lines 1 and three rhyme also appeal.
Wit and humour is appreciated .
Your chosen form can also be sequenced upto a max of 12 lines.
You may enter poem from your back catalogue ,winner or otherwise