The use of contours and colour to depict surface height (Colour).

50 meters contours digitized from Scottish ordinance survey maps on a slightly skewed equal land area projection software by author on an Archimedes computer.

The graphic shows how colour can be used to great effect in contour diagrams to show something of the actual shape of complex terrain. Unfortunately, here some of the hues between the blue and yellow were darkened in the printing process, but the overall effect is still dramatic.