In most languages the colors are defined as the language progress The order: 'black', 'white', 'red', 'green', 'yellow', 'blue', 'brown', 'orange', 'pink', 'pu

In most languages the colors are defined as the language progress The order: 'black', 'white', 'red', 'green', 'yellow', 'blue', 'brown', 'orange', 'pink', 'purple', and 'grey'. So for a period of time trees are actually blue.