[MUSIC] I have two questions for you. First, how many colors in the rainbow? Looks a simple question, and probably the answer that pops in your mind is seven. But think twice. How many colors in a rainbow? Look at the rainbow. A million colors, an infinity of colors. Strange, there is an infinity of colors and you only keep seven in your mind. Second question. You know Greece, you know Athens, the hill, the Acropolis, and on the top of the hill you have a temple called the Parthenon. Everyone knows the Parthenon, and you know I'm sure. My question is, how many columns on the front wall, under the triangle, how many columns? The answer is eight. But, did you know the answer? Maybe not. It shows even the Parthenon, you think you know, and you don't. What can we take out of those two exercises? One single message. You never have here what's out there. Rainbow, a million colors, you keep seven. The Parthenon, you have a fuzzy image. Bon, it's a fact, but it's also a message. When you think you only use simplification of the world, this is true for the Parthenon, for the rainbow, but it is also true for the business. Maybe you have a million clients, maybe you have 100,000 of products. When you think about your business, you also use simplifications. This is the key of my whole course. You can use the simplification, not too difficult, but the question, how do you simplify? How do you simplify your business in order to change the world? And this answer comes from great philosophers. I spent 40 years in business, and I want to have an answer to this deduced question. That's why I study philosophy and that's what I want to share with you during this course.