if you would have three rooms with one being a normal living space, another being closed air tight and the last just closed and no one enters, you would see a drastic difference in the amount of dust. dead skin does create dust, as do other "creatures" living with you. also when you go in and out you bring outside air with you which also contains dust...pollen...etc. also heating and air conditioning stirs and circulates dust.
the air tight room will be nearly free of dust.
the non traffic room will still get a certain amount of dust from any heat source and air that naturally circulates through.
Contrary to popular belief most dust is just dirt with a little bit of dead skin cells, insect parts, and pollen mixed in. You also use more then 10% of your brain, your hands and feet have special blood vessels that contract so you don't loose 10% of your body heat through them, and there is no scientific evidence whatsoever to support psychic phenomena.
What about all the dried earth, sand etc....?