Multiverse is a volume of nonsense verse with themes ranging from cosmology and philosophical questions about the nature of the universe… to mince pies and listening for worms.
If you were a clownfish, swimming languidly and contentedly amongst the anemones on a coral reef, you would assume that the charming ecosystem you inhabit is the entire universe. But suppose a diver with a net appears and lifts you out of the ocean. You see creatures you’ve never seen before. You see boats and a coastline and the sky above. Suddenly it dawns on you that your world is just a small part of a larger macrocosm. A much larger and weirder macrocosm than you could ever have imagined in your wildest dreams.
And what if there is a parallel universe in which clownfish are keen on tennis and frequently speak in rhyme? And what if this isn’t a hypothetical question?