show differences in relative quantities with differences in luminosity/hue (+ hex bin) NB: relative quantities only, using for absolute quantities is misleading colour choice:

• monochromatic: for sequential values
• diverging: 2 or more colours, implies average + deviation Category breaks: There are three common choices for category breaks: natural, equal interval and quantile. Quantile breaks should be the default choice, unless you have a very good reason to do otherwise. Choosing a different break type can help if you wish to emphasise a specific pattern found in your data but make sure not to move from emphasis to manipulation. • pattern type: continuous/sequential: blurs boundaries, use for hotspot effects; discrete/qualitative: emphasises boundaries, use for classification