The appeal to human manufacture as the only valid reference for design is disingenuous. Intelligence has recognizable hallmarks. We use human design as a standard only because it is the form of intelligence we know intimately, not because it is the only kind that could exist. To say that something shows the traits of design does not require that the designer must be human, failing that it must be blind unguided nature. When we find a shaped stone that serves a purpose, bears the marks of percussion, and has balanced symmetry, we do not hesitate to infer that someone, not something, made it. The inference is drawn from the evidence of purposeful arrangement, not from the identity of the maker.
The same logic applies to biological systems. The bacterial flagellum and countless other molecular machines display coding, coordination, error correction, and functional integration, that in every other known case, comes only from intentional design. The absence of a known manufacturer does not erase the signature of purpose; it only reminds us that the designer is not yet identified.
The hallmark of design is the reversal of both thermodynamic and informational entropy. In nature, energy disperses and information decays toward noise, yet living systems move against that current. They preserve, repair, and transmit coherent information while resisting the disorder that physics would otherwise impose. That behavior is not natural, it is purposeful organization acting within nature but cannot be explained by it.
Functional information capable of resisting both forms of entropy is unnatural on its face. It maintains structure and meaning against the very forces that destroy them. Such resilience, along with the capacity for error correction and adaptation, marks the presence of intelligence. A system that moves with intention, that preserves and builds order rather than letting it collapse, is not a product of chance. It bears the unmistakable signature of design.