The phrase "what yellow and purple do, some say" refers to how these two colors interact visually. Many say that yellow and purple clash because they are complementary colors opposite each other on the color wheel. This stark contrast can create a sense of disharmony or visual tension, which is why some people describe the interaction as a clash rather than harmony. However, this perception is subjective and may vary depending on context and taste.
Beyond this, yellow often symbolizes positivity, happiness, and warmth, while purple can represent wisdom, luxury, or sometimes negative concepts like poison or pride, depending on use. In certain narratives, yellow and purple colors symbolize opposing themes, such as good versus bad choices or different emotional tones.
In summary, the most straightforward answer to what yellow and purple do, "some say," is that they clash visually.