One recognizes a usable book when one likes to use it. A usable book easily becomes our everyday and lifelong companion. It elevates oneself to a higher sense of humanity. It stands as a testament of beauty.
The text of a usable book always sound poetic. It just rings right. It satisfies a need while bringing pleasure. Its structure makes it stand on its own.
Good poetry replenishes by putting the mind to work. Bad poetry consumates the mind to a task, a chore, a duty.