Looking at Earth from outer space, it's difficult to imagine how human life is organised. If we look closer, we begin to see the structure of individual communities.

Looking closer still, we can see that communities are highly organised, with the constant movement of people and materials adapting to a continually changing environment.

In a city we are used to the bustle of daily life. Yet we can learn a lot from studying the complex ways in which cities have grown, continue to grow and survive.

While it may seem a big leap from a working city to a living cell, the organisation of different activities into different areas, the transportation of raw materials, the building of new structures, the production of energy, the removal of waste and effective communication systems are all just as important for a cell, as they are for a city..