Four colors matched beautifully

Quick answer：

The concept of color harmony in design and aesthetics suggests that certain combinations of colors look pleasing to the eye. In the context of interior design, fashion, or graphic design, a color scheme that is well-matched and balanced is often considered attractive. Commonly used color schemes include monochromatic, complementary, analogous, and triadic. The 'four colors' mentioned could refer to any combination of these schemes, but more specific information is needed to provide a detailed response.