I can almost hear people saying "This isn't a theme, it's an object." Well, I want to give a little credit to that idea, but for the most part, I want to say "No, this is a theme!"
In the early days of science fiction, robots or mechanical designs were used either as a side factor or to keep the main character's story alive. But in later periods, the robot theme expanded to a wider audience and, with the development of technology, the concept of Artificial Intelligence also emerged as the main character in works.
One of the biggest factors in the emergence of this theme is the principle of imagining what will happen when we give life to machines we create with our own hands. At first, the robots or mechanical designs created were quite rigid in appearance. In fact, some robots only used lights as their eyes. However, over the years, designs have become quite advanced. The rigid robot figure gradually took on the form of a human skeleton and human-like movement capabilities, and finally was created like a human.