What is a form poem?

Now this is a poem called a pyramid and as you can see it's set out in the shape of a pyramid. I like experimenting like that with shape poems. Now this is a nonet and as you can see the lines get shorter as we go down. That's because we have nine syllables in the first line, eight, seven, right down to one at the end. I thought that was a fascinating form. Over here we've got the tenon, which is reversed, starting with one syllable, going down to nine.

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