Significance of Wind in L'Eclisse

I thought there was always a fan because it was hot. OR that life no one knows where the wind blows and the same can be said about life. That or maybe it's left up to the viewer about the significance. My view may be different then someone elses.

*SPOILER*
i changed my mind. maybe the wind blowing indicates a 'storm' is blowing in because the end the guy is reading a paper about nuclear war and you just get silence in the scenes for about 5 minutes and i am assuming it's indicating death is at hand... unless i interpreted that wrong. feel free to say otherwise

I like agodinruin's interpretation, and I will add -

The wind represented Vittoria's inner state of mind, her emotions, her energy, her life force, the wind represented a natural, ceaseless, timeless entity that that "lit her up", pushed her forward, freed her mind, energized her, connected her to nature, and dualistically reminded her that human existence was meaningless, and the wind also opened her eyes to the complexity of love - she was keenly aware that she could not see wind - she could only see the objects the wind touched (just like love...) but not the wind itself, and that paralleled her realization that people could not see or even feel the emotion of love: people equate love to specific physical acts, love is considered present when specific physical acts occur, but without the physical acts, one could not discern/see love. Love and wind are intangible, unfathomable, invisible...

Just wanted to mention that the wind begins to blow during the final shot of Alain Delon sitting at his desk at work. Signifying what? Maybe emotional change. Maybe the temporal nature of all things on this earth.
Also I think Monica Vitti drops a small folded fan into the barrel of water at the meeting spot.

I think majority's interpretation's wind's signification as a change is more than agreeable. IMO I think it runs in theme with Vittoria's psych, the stock market, Piero's love life and also the title of the movie signifies it as well. In fact, "ceaseless" is such a beautiful word to describe the whole thematic of the movie. There are constant flow of change and fluctuation of one kind or another. Two character's Vittoria and Piero are in momentary eclipse within their own constant. After viewing this movie I think it's inevitable of the parting of the lovers.

I'm going nuts over this movie.

I felt the wind complemented the quality of capriciousness in Vittoria's personality. She is notably subject to whim, impulsive, and unpredictable, which is representative of many people who enter into relationships. They end up where ever the wind takes them without regard to reason. In the first scene, Vittoria very clearly reveals her capricious, flighty personality to us. She doesn't know why she doesn't love Riccardo anymore, just that she feels she may be happier elsewhere with no logic or reason as to why. The rotating fan is blowing throughout that entire scene and we get the sense that Vittoria is like a loose piece of paper about to randomly float out the window.

Of course, this is the start of Vittoria's random flight. The wind throughout the rest of the film reminds us that we are on continuous random walk with her. At the end of the movie the wind is still blowing and Vittoria is not seen again - she has left even us behind.

The sense of freedom and yet of emptiness...