Red and blue ruler design

Quick answer：

The 'red and blue ruler design' typically refers to a design featuring a ruler with red and blue colors. This could be a simple aesthetic choice, or it might represent a specific concept or theme, such as the color spectrum or binary oppositions. In design, the use of colors like red and blue can evoke emotions or convey messages, depending on the context. For example, red is often associated with energy and passion, while blue is linked to calmness and stability. The design might also have practical applications, such as indicating different units or scales in a ruler. More specific information about the design would be required for a detailed analysis.