So the topic for today is abstraction. And this is a very important layer of computer because you can't do anything with a computer unless you have a symbolic system in place. Right. So we're talking about the origin of symbolic systems. Language is a classic symbolic system. Apparently one theory for why language evolved is that people communicated with sign language and with movement quite well for a long time. And it turned out that they wanted to communicate even while they were doing things. So, while they were trying to strangle the dinosaurs, not the dinosaurs, the rhinoceros, they wanted to say "Come help me" and they use sign language to do it. They had to let go the rhinoceros and the rhinoceros ran away. So you can see that it's a good idea to be able to do something with your hands and be able to communicate at the same time.
Significantly focusing on the fact of symbolic language and it comprises that abstraction is an important layer of computer because people cannot do anything on computers without symbolic system. Additionally, language is the classical symbolic system. Sign languages and movements are used to convey ideas, this is supported by the example that people asked for help by waving hands when they repelled rhinoceros. Thus, human communication combines both gestures and words.
