Dog
The domestic dog demonstrates impressive adaptive capacity across contexts. Breeds have been developed for herding, hunting, guarding, detecting, guiding, and providing emotional support. A single dog may serve as security system, exercise partner, social facilitator, and therapy provider. Dogs have been trained to detect medical conditions including seizures, hypoglycaemia, and certain cancers with accuracy exceeding 90%. However, dogs cannot be repurposed between owners as readily as tools, and their versatility depends heavily upon training investment.
Hammer
The hammer's versatility, whilst appearing limited, reveals surprising depth upon examination. Beyond driving nails, the claw end extracts them. The flat surface serves demolition purposes. The handle provides leverage for prying. Emergency applications include breaking glass, self-defence, and percussive maintenance of malfunctioning electronics. Archaeologists note hammers served our ancestors for butchering, crafting, and construction simultaneously. Yet fundamentally, the hammer performs variations of a single action: applying force. Its versatility remains thematic rather than transformative.