To be truly innovative, you need to think like a kid playing with Legos, write Hal Gregersen, Jeff Dyer and Clayton M. Christensen. The most creative designs come about when children bring together pieces from lots of different Lego kits, they write. "Similarly, the more knowledge, experience, or ideas you add from wide-ranging fields to your total stock of ideas, the greater the variety of ideas you can construct by combining these basic knowledge building blocks in unique ways," they argue.