The colours are taken from Spiral Dynamics and there is no deep meaning behind them. Simply, conventionally, a culture oriented to rigid hierarchy and subordination is called ‘blue’, and a culture oriented to attention to the individual and their needs is called ‘green’. We will go into more detail about organisational cultures in the second phase; you can read about Spiral Dynamics in two of the most popular books: [Don Beck, Christopher Cowan – Spiral Dynamics: Mastering Values, Leadership, and Change, 1996]; [Frederic Laloux – Reinventing Organisations, 2014].