Cultures can be well thought of as sand dunes, as explained by Professor Jürgen Bolten. They are at the same time like the shifting sands of time and the firm sediment, resistant to change. Cultures have fundamental behavioural rules that are formalized over centuries through laws, natural environments, and traditionalized rules, for example. These are often considered non-negotiable and changing them takes at the very least a very long time. Cultures also have aspects that are more flexible, relative and subject to change. The fundamental aspects form the sediment of the dune, and the more relative aspects are the top, subject to the shifting winds.
The cultural aspects at the top are more related to individuals or smaller communities, and can be negotiated. The sediment is more like the structure, laws and unnegotiated ‘facts’ of a culture or society. However, the sand at the top can also move further downwards and become more firm and less negotiable. And even the sediment part can change, e.g. in extreme circumstances. The dune has three layers, ‘can’, ‘should’, and ‘have to’. The content of the layers guide the behaviour of the people affected by a certain culture.