IKEA is the world's largest furniture retail chain with over 400 stores worldwide and a billion customers each year. The founder, Ingvar Kamprad had a vision to make people's everyday lives better and this has shaped the company's evolution over its 80 year history. Ingvar created competitive advantage through constant innovation, looking to other spheres of life for inspiration, rather than copying what competitors were doing.
Further discussion on what has made IKEA successful can be found in this LinkedIn post.
Sources: Eating the Big Fish by Adam Morgan; this article by Scott Guthrie.