A Mature Tube

Nature is the ultimate master of the mature tube. Look at a tree.

In high-end architecture, you will now see "pre-weathered" copper downspouts. The architect doesn't want the bright penny color; they want the mature tube's seafoam-green patina. Except, fake patina looks like paint. Real patina (achieved by exposing the tube to salt spray and time) is granular. It sheds water better because the surface tension of water breaks on the crystals, causing droplets to fall off rather than smear. a mature tube

During vascular development, endothelial cells first gather in solid cords. Through a highly complex morphogenetic process, these cords hollow out. Nature is the ultimate master of the mature tube

In addition to its role in transportation and defense, the mature tube also provides structural support to the plant. The rigid walls of the tube help to maintain the plant's shape and provide resistance to external forces, such as wind and gravity. The architect doesn't want the bright penny color;

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