Sémaphore, a retired sailor reinvented as an inventor, occupies a suburban home workshop alongside his anthropomorphic white dog. His well-intentioned inventions, crafted to aid or innovate, often spiral into chaos through mishandling, sabotage, or latent design flaws, sparking comedic turmoil—especially when tested by his canine partner or disrupted by external forces.

Their bond subtly challenges conventional hierarchies, blending camaraderie with mutual reliance, as the dog occasionally assumes human-like duties that invert typical owner-companion roles.

Expanded narratives introduce a neighbor harboring unspoken affection for him and a cunning rival cat, amplifying situational humor. These dynamics position Sémaphore as a central yet unwitting participant in community escapades, though his devotion lies steadfastly in tinkering.

Throughout adaptations, his core remains unchanged: a relentlessly inventive figure whose creations fuel both camaraderie and calamity through unpredictably chaotic consequences.