At a first glance, this tree seems like it was a victim of graffiti vandalism. But if you'll look closer, you'll see that it hasn't been spray painted - the tree is coloured like this naturally.
Eucalyptus deglupta is a tall tree, commonly known as the rainbow eucalyptus, Mindanao gum, or rainbow gum - it's the only eucalyptus tree that grows in the Northern hemisphere.According to Wikipedia, the brightly coloured streaks that cover the trunk are a distinctive landscape design element.