The Poem Tree

You may have to forgive my ignorance, but the phrase 'poem tree' doesn't mean much to me. A quick Google reveals that it's a popular name for poetry anthologies and blogs, but that still doesn't tell me why this set of decals is named the Poem Tree.

Never mind; it was the look of the piece that attracted me. Position the trunk on any wall, and then it's up to you where you put the leaves, flowers and birds, presumably meaning that each purchaser will end up with a slightly different tree. That's a kind of poetry in itself, surely.