Now you're ready to play "Kant." In order for something to be known, it has to make it "in" to the mind. It has to go through the structures of time and space, and through the categories, before it can become intelligible. Whatever fits through is "phenomenal" and able to be comprehended. Whatever can't fit through is "noumenal" and unknowable by pure reason.
Voila! You've just mastered "The Critique of Pure Reason!" and if you let your child play with this toy, she will grow up to be a genius.