This is a particular species of tree which reveals many different colors when shedding bark. It is known as the Rainbow Eucalyptus and it is native to Indonesia, Papua New Guinea and the Philippines.
When bark first peels off the tree it reveals a bright green color underneath, however this green layer changes color as time progresses - turning hues of orange, blue, purple, brown, yellow and maroon. As parts of the tree are shedding at different rates, the exposed layers can be of different ages and therefore different colors. This is what makes the tree look like it’s been streaked with rainbow paint!
