How we behave will determine the culture that we build. At the same time the culture that we build will shape the behaviour we display. So to change our culture, we'll need to change our behaviour.
And this is of course easier said than done.
Because of our social nature, we just can’t help ourselves. The moment a group of individuals comes together; a culture gets formed. People will start determining how they like to interact with each other, what artifacts they like and the meaning of those artefacts. The group will amplify the values and and beliefs they can agree on. As the group starts interacting with other groups the culture gets shaped further and amplified, creating a powerful feedback loop.
This distinction between us and them is one of the most powerful forces driving interaction. The us and them distinction will build cohesion and strengthen the group, however at the same time as these positive emotions towards ‘us’ develop, negative feelings towards ‘them’ are created. Who belongs to ‘us’ and who belongs to ‘them’ is determined by setting and context.
At times when these forces are preventing collaboration, a simple reframe or explicit discussion about the common goal might be all that is needed.
Cultures get formed almost immediately but, like behaviour, might be hard to change. Like any change, this is a two-step process, insight followed by actual change.