What is Poetry?

What is poetry? What is it?
Is it words in lines the author chooses?
What makes poetry? What makes it?
What makes prose not poetry?

Ancient poems in verse were written
Rhyme and meter being sound and rhythm
Modern Muses cast off scansion
Writing, lacking meter, modern poems.

Is just imagery sufficient?
What do poets want to make in writing?
Is mere metaphor unfinished
When it lacks the form of ancient writing?

What is poetry? What is it?
How am I my poetry to write?