The Think CMYK series demonstrates how limitations like these can spur on creativity to produce good and innovative designs. The book is dedicated to the four colours of the CMYK colour model. Combined, the four colours provide a perfect guidebook and source of inspiration. Also, they simple make a good collection of inventive graphic design. Cyan, often simply referred to as turquoise, is a bluish-green colour. The name is derived from the Greek Kuavos. Meaning dark blue, it has been established by the Euroscale standard. CMYK denotes the colour-range of four-colour process printing. However, not every print product is being made this way. Often, financial restraints require the confinement to one or two colours or just black and white. Sometimes clients ask for designs made using one particular colour only because it has symbolic value or the colour is part of a companys corporate identity. Therefore, the biggest challenge every graphic designer or illustrator has to face is to work with just ONE colour: Cyan, Magenta, Yellow plus Black.