Colour-coded costuming and how it guides the eye
Launch library · evergreen read

Costume designers frequently use colour as a deliberate visual tool in large dance numbers, assigning specific colours to lead performers so the eye can find them instantly even within a crowded, fast-moving formation of dozens of background dancers dressed in a coordinated but distinct palette.
Background dancers are often dressed in muted or complementary tones precisely so they support the composition without competing with the leads for attention. A subtle shift in the group's colour palette between sections of a song can also signal a change in mood or energy without a single word of dialogue.
Lighting designers coordinate closely with this colour planning, since the same costume can read very differently under warm versus cool lighting. Some productions test colour combinations under studio lights well before shooting to ensure the intended contrast survives the final edit and colour grading process.
This careful colour planning is rarely something audiences consciously notice as they watch, yet it quietly shapes how easily a viewer can follow a complex number's visual story from its first beat through to its very last, without a single moment of visual confusion setting in.