The Pastel Orange color is a medium tone of yellow-orange which can be combined with other colors to create an equal mix. It has been said that it's also sometimes classified as red and called "coral" by designers because its vividness makes for great artwork or interior design schemes where people want something bright but not too overbearing in their room decorating scheme.
The secondaries are secondary colors (red/yellow) made up from two primary ones mixed together; opposites attract one another considerably more than similar tones do - this accounts for why we find complementary objects placed side by side attractive rather than closely related