Most of us (sadly not all of us) are familiar with the experience of not knowing something. Few of us are intimately familiar with the concept that some things are objectively true or false but  unknowable. Apart from purely religious word game, we rarely try to imagine how the simple fact of human architecture could prevent us from knowing ore even suspecting important facts about reality. This is not about our weak abilities of perception. It's about the limitations of what we can imagine. Trying to imaginine the unimaginable Consider the poor Golden Doodle, lets call her HEX. Doors and gates are super important to HEX. In fact they keep her alive in a way she cannot possibly understand. Yet she is always experiencing doors. It's amusing to see her mind work as she tries to wrap her mind around this concept. She knows, for example, that doors are a transition from one space to another. She has also figured out that she needs permission to go through a door. In a house she has...