Wasps invented paper roughly 60 million years before humans did. The process is identical: chew plant fiber, break the cellulose into shorter strands, suspend the fragments in water, let the slurry dry into a flat sheet. The material bonds through hydrogen bridging between hydroxyl groups on adjacent cellulose chains. A wasp nest and a sheet of printer paper differ in scale and substrate but not in chemistry.
Cai Lun, a Han dynasty court official, is traditionally credited with the insight around 105 CE. The story says he watched wasps build their nests — saw them chew bark and plant stems into a pulp that dried into thin, strong walls — and realized the same process could produce a writing surface. Whether the legend is precisely true matters less than the fact that the process it describes is technically accurate. The operation Cai Lun performed on rags and mulberry bark — maceration, suspension, sheet formation — is the same operation the wasp performs on wood fiber with its mandibles.
Two thousand years of industrialization have not changed the fundamental mechanism. Modern mills use mechanical grinders and chemical dissolvers instead of mandibles, and they process wood pulp instead of bark. But the transformation is the same: break long cellulose chains into shorter ones, suspend them, let them hydrogen-bond into a sheet. The Fourdrinier machine that produces paper at 60 kilometers per hour does exactly what a wasp does in miniature.
This is not convergent evolution in the usual sense. The wasp and the papermaker are not solving similar problems with independently derived solutions. They are performing the same physical operation because it is the only operation that produces this material. Paper is not a design. It is what happens when cellulose is macerated. The wasp found the route. There was never another one to find.