Colors that reside directly across from one another no the color wheeel ate calles c
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The answer is complementary colors. these colors can also cancel each other out. for example, there is GREEN makeup meant to go over RED spots, because tehe two cancel each other out

Because they admired it maybe

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.