Pace Layers describe how different parts of a system change at different speeds, which can influence how interaction design evolves. In design, fast layers like trends or user interfaces change quickly, while slow layers like technology infrastructure or societal norms take longer to shift. Designers need to balance these layers, making sure their work stays useful and adaptable over time. For example, if a design focuses too much on fast-changing trends, it might become outdated quickly. But if it aligns well with slower layers, like core user needs, it can remain relevant even as trends change.