People, spaces and places - The Visualization of Spatial Social Structure - page 55

Postcode Sectors
Coloured at random.
Figure 2.15 These 8604 areas are drawn on an equal land area map. This is
the finest level at which it is possible to map the boundaries of postcode unit
geography. The first half and next digit of the postcode locate these areas. The
image reveals a picture of population density as the white boundaries coalesce.
Density is apparent despite the random colouring within all the white lines.