Ages 5-8. Does something exist even if you can't see it? A humorous bedtime story for budding philosophers. Young children will love pointing out the rhinoceros in each spread. Older children will enjoy thinking about how the moon is still there even when we can't see it. Philosopher Ludwig Wittgenstein discussed the power and the limitations of language with his professor Bertrand Russell: how even if you don't see something, it can still be there. 40 pages hc