The behind-the-scenes French docudrama “Culte” (in French, with subtitles), available on Amazon Prime Video, captures the birth of reality TV in France. And like many births, it’s a messy and emotional process, with plenty of screaming and crying from multiple parties, some unhelpful meddling from the families, fits of doubt and unknown reservoirs of determination.

No one is quite the same after, and then there’s this whole new being to take care of. In this case, it’s “Loft Story,” a “Big Brother” adaptation that debuted in April 2001.

Isabelle (Anaïde Rozam) is a stymied TV producer, a failure in her publishing-royalty parents’ eyes. She seizes on the format of “Big Brother,” a new hit show in the Netherlands, but the bigwigs are averse to anything they deem trashy. Reality shows are “voyeuristic, macabre, mind-numbing,” says one executive. “Hellish,” another agrees. “We can’t be the nation of Chartres cathedral and 12 dummies living in an apartment.” Well … just you wait, monsieur!

Isabelle vows that her show will be something politically provocative, a social experiment with participants who reflect the totality of France in age, income, ethnicity and outlook. But once the production countdown begins, some of her grander ambitions give way to what we can now see as the basis of most reality casting: Round up some sexy drama llamas, and let the cameras roll. No one is prepared for what unfolds — the fame, the derision, the ratings bonanza.

Over its six episodes, “Culte” moves with speed and agility — and, praise God, only one timeline — and its characters’ maneuverings are just as loaded and occasionally backstabby as any reality villain’s. The apparently nationwide hand-wringing about the dangers of lowbrow entertainment feel quaint, almost darling. “Does French TV still have morals?” someone wonders.

But lurid tabloid stories have a way of setting the conversation, and TV networks are rarely in the morality business; they’re in the ratings business. “The Americans have a term for this,” a network head says, his eyes agleam. “‘Buzz.’” “Loft Story” indeed puts every apiary to shame.

“Culte” makes the most of its festive, exciting ambiguities, and the “Loft” folks do not try to occupy a moral high-ground, nor could they really. They merely wander the bumpy natural topologies of society, and maybe no one is much higher or lower than anyone else.