Also known as "almost-but-not-quite-not-quite-an-analogs," tertiaries are colors that are a little too similar to their primaries and secondaries to be their own thing. But not too similar to be just any other color, either. They occupy a special place in the spectrum, like that weird cousin at the family reunion who's always a little awkward.
Tertiary Color Theory: Because Who Needs Actual Science, Anyway?