These are poems about innocence. They could also be called “poems about childhood”.
In a sense they describe the disillusion that comes with growing up and losing all those brigt future prospects one had dreamed up. The future just wasn’t that bright. In reality it came with a hardy dose of realism, and even pessimism.
You feel your imagination tighten and deal with fewer things. One’s ability to visualize becomes weaker unless carefully trained. And what do you get in exchange? Bills to pay and disputes to settle that you hardly even know how started.
Poems about innocence describe the loss of innocence, and the longing back to childhood.