Touch- whether the stimulus is pressure or pain, heat or cold, the only things which we know are experiences which occur in the various areas of the cerebral cortex. Pain is not located in the red hot coal. Our Senses Deceive Us Grapefruit may not be yellow. It is perceived as yellow by you. It may look green and be called yellow by others.
Language is part of the problem.
What I see as yellow may not even be present. Never have enough senses to process all of the waves present. We each live in our own private, personal shell. We try to break out of our shell and make contact with the world and other creatures, we only rediscover the depth of our predicament. We live with our own experiences.