The examples above dealt with the senses of sight, sound, and touch. Smell and taste are noticeably absent if you consider all the human senses. One might say that there is no way you can mathematically represent the smell of burning wood or the taste of a pizza. But I believe that these perceptions are mathematically represented in our brain, after our senses perceive them. In any case, I am going to avoid addressing the senses of smell and taste in this document. Although there may be some important use cases for making a computer incorporate these senses (fire, drug, and bomb detection for example), I will downplay their involvement in this document.