Concepts are sometimes hard to grasp and opposites may be a challenge for some. In the opening spread readers learn that everything in nature has an opposite. If something is rough then another item will be smooth to be the counterbalance. One of the easiest opposites to understand may be size. Something is big versus small, or tall versus short or heavy versus light. Another of our sense is touch which can tell us the texture of things. Sometimes we can tell the texture just by looking at something like the spiny back of a hedgehog.