The article discusses the comparison between a lightbulb and a hammer. It emphasizes the fact that these two items are very different from each other and cannot be used interchangeably. A lightbulb is used to provide illumination while a hammer is a tool used for pounding or driving nails. The article highlights the importance of understanding the specific purpose and function of each item in order to effectively utilize them. It stresses the idea that trying to use a lightbulb as a hammer or vice versa would not only be ineffective but also potentially damaging to the object being worked on. Overall, the article emphasizes the importance of using the right tool for the right job and the significance of recognizing and respecting the unique functions of different objects.