Our body organs use certain signals to indicate our brain about what is around. We feel solid things when atoms are separated from each other the whole time. We listen to only sound that our ears can pick. We see only things that reflect light. How is any of this real and we sure bout it. What is it that shows purple color when I stop my thoughts. Why can we hear our own voice in our head when there is no sound involved. Do we really know what we think is real is just a small dream and what we think is a dream will always be our reality when we die? What is the concept of being human or any animal if we have to kill each other.