PALM BEACH, Fla. — The second day of the WWD Beauty CEO Summit was full of insights, including a broad-brush picture of what it is that makes the industry so remarkable. “What I love about beauty is that it’s changing over time,” said Alexis Perakis-Valat, chief executive officer of L’Oréal USA. “It’s in the land of emotions and of rational thinking, of desire and functionality, of left brain and right brain, of math and a lot of logic. This blend is absolutely amazing. And, of course, the fact that it’s a force for good.” Related Articles Plus, as author, fashion designer and philanthropist Diane von Furstenberg put it: “Life is an adventure, and your life in business is an adventure, too. So follow your heart and do the best.” Here, four main takeaways from Wednesday.…