Final answer:
The question seems to be about notable changes in France's atmosphere following important events. It could refer to the changes seen post the Clichy-sous-Bois riots in 2005, during the French Revolution, or after the ban on veils in public schools in 2004.
Step-by-step explanation:
The question appears to be missing some specific context, but one potential interpretation based on the provided hints could be related to noticeable changes in France's atmosphere following significant historical events. For instance,
France might notice unusual things following important moments such as the serious riots in 2005 in Clichy-sous-Bois, or perhaps changes seen during the time of the French Revolution when economic conditions worsened, causing public unrest and unconventional measures from citizens. Similarly, changes could be perceived in response to the ban on veils in public schools in 2004, considering this affected a specific portion of the school-going population, and might have created an unusual atmosphere in schools.
Learn more about Significant Historical Events in France