Imagine traveling in the forest and you suddenly notice that the tree trunks are colored. You might think that someone painted them with paint. However, it turns out that nature itself can be very inventive. The rainforest eucalyptus forests growing in Papua New Guinea, Hawaii, Seramo and several corners of the globe are striking in a wide color palette. Red, orange, green, yellow, violet, bluish shades blink in tree trunks. The old bark of the plant is laced with vertical lobes, these darken, while the new bark is much lighter. For this, it seems that the tree trunks are painted on a rainbow principle.