The colour wheel helps us define the relationships among the various colours.. The chromatic spectrum visible by the human eye is arranged in the form of a circle through which we perceive the possible derivations and conjugations and the various harmonic relations.
 
Colour wheel / Primary colours
In nature, it is from primary colours like the yellow, blue and red that all colours are derived from.
 
Colour wheel / Secondary colours
From the combination of thesewe obtain the secondary colours.
 
Colour wheel / Terciary colours
From the combination of primary colours with secondary colours we obtain tertiary colours.
 
Colour wheel / Complementary Colours
These are the colours that occupy opposite positions in the colour wheel.