Why does 'You're So Vain' have that "I had a dream they were clouds in my coffee" lyric in what is otherwise a quite sensible song?

Can you tell me what the meaning of the phrase "clouds in my coffee" has in the context of your song "You're So Vain"? I can't quite pin down the metaphor. What are the "clouds" in your coffee? Samantha - Dearborn, MI

"Clouds in my coffee" are the confusing aspects of life and love. That which you can't see through, and yet seems alluring...until. Like a mirage that turns into a dry patch. Perhaps there is something in the bottom of the coffee cup that you could read if you could (like tea leaves or coffee grinds). Carly Simon 5/17/01

In a 2000 interview with Charlie Rose, Simon explained the origin of this song: "There was originally a song that had the melody of what is now 'You're So Vain,' called 'Bless You Ben.' It went 'Bless you Ben, you came in, where nobody else left off, there I was, by myself, hiding up in my loft.' It never went anywhere, I could never fall in love with it. And then I was at a party and somebody walked in and my friend said to me 'Doesn't he look like he's just walked on to a yacht?' So, I thought to myself - hmmm, let me write that in my notebook. And then one day, when I was playing 'Bless You Ben' on the piano, I substituted 'You walked into the party, like you were walking onto a yacht' and the exchange was equal. And it felt natural and it felt good and then I could get into that man, I knew who I was talking about."

Simon came up with the "Clouds in my coffee" line on a cross-country flight. She explained the meaning of the phrase, saying: "Clouds In My Coffee are the confusing aspects of life and love. That which you can't see through, and yet seems alluring... until. Like a mirage that turns into a dry patch. Perhaps there is something in the bottom of the coffee cup that you could read if you could (like tea leaves or coffee grinds)."

The phrase came courtesy of her friend and musical collaborator Billy Mernit, who was sitting next to Simon on the flight. Carly had the window seat, and Mernit noticed the clouds from the window reflecting in her coffee. He said, "look at the clouds in your coffee," and mentioned that it looked like a shot from the 1967 French movie 2 or 3 Things I Know About Her, directed by Jean-Luc Godard. In the film, there's a poignant shot of cream swirling in a cup of coffee. According to Mernit, he and Simon both wrote the line down in their journals, and a few weeks later, Carly called him and asked if she could use it in a song.