Body plan as first technology
Multi-limbed manipulation, tactile sensing and fluid environments change the design of every tool and habitat. Designers begin with reachable contact surfaces, bracing, hydrodynamics and safe loads, not miniature human control panels.
Expression is not translation
Light patterns, skin markings, sound, chemistry and posture may complement one another in layered messages. Water clarity, range, illumination and timing limit their effectiveness. Spoken dialogue in a novel is an interpretation rather than literal underwater speech.
Scientific evidence, carefully used
Real cephalopod neurobiology, camouflage, regeneration and deep evolutionary history inspire rigorous questions. They cannot demonstrate that the fictional Thalassari exist or establish their exact physiology. Scientific analogies remain analogies.
