- Particles at this scale naturally clump together highlighting the major areas of air travel.
- Integration with a world daylight representation provides a suitably visually orthogonal set of representations for easy spatial comparison of time of day and air travel intensity.
- Air travel is seen as an aggregated daily process across the world.
- Aesthetically it is pleasing - ugly visualisations are beyond contempt.
- It also brings home - if air travel is postively correlated with economic activity - why the US still strongly influences the world economy.