A 'treasure in the trees' reveals the exchange of materials between man and animal. This beautiful house finch nest, made of natural resources and manmade garbage, demonstrates how 'bird architecture' is able to make use of materials which are useless to us. For some people it might be art, but from another perspective this nest is a pure representation of how humans contribute to nature’s development. Certain bird species use their nests to compete for mates. High-tech-garbage, which contains materials like plastics, textiles or wires, might take their mating rituals to the next level (and to the next nature).
Image from Sharon Beal's Nests: Fifty Nests and the Birds that Built Them.