Two concentric circles, containing a series of segments, each bearing a different colour of the spectrum .....The Colour Wheel The segments follow alogical sequence, for example, if wewere to start with yellow,the next would be yellowish -green followed by green, greenish-blue,blue,indigo,violet,violet -red,carmine,red,reddish-orange,orangeand black to yellow! The colours that are diametrically opposite each other,set each otheroff and are called complementary colours. There is also a triangle of basic or Primary Colours and a triangle of compound or Secondary Colours within the colour wheel. You can use the colour wheel as a guide to using the right colours in the right place, in combination or by themselves.