Understanding Data - Data Points: Visualization That Means Something - page 20

F I G U R E 1-12: Louisiana map from A More Perfect Union (2011)
VARIABILITY
In a small town in Germany, amateur photographer and full-time physicist
Kristian Cvecek heads out into the forest at night with his camera. Using
long-exposure photography, Cvecek captures the movements of fireflies as
they prance between the trees. The insect, as shown in Figure 1-13, is tiny and
barely noticeable during the day, but in the dark, it's hard to look elsewhere.