Here are the things that Human perception describes reality with:
gravity(that is if you are not in sapce)
Here are things that are undefinable yet part of our perception. They cannot be sensed by using the 5 senses:
How do you define these unknown and unseen variables? They exisits, yet cannot be seen with the naked eye. Like information, what is it, it exist and is transmitted in computer networks, yet what is it? Does these things really exist? What part does it play in the experience of being human?