" Like Edison, who built new innovations on top of previous inventions, innovative leaders never declare an invention “done,” Mr. Axelrod says.

“Everything ultimately became the source of something new later,” he says. “It’s like the difference between a rich person and a wealthy person. A rich person has a lot of money and buys things. A wealthy person invests in things that make more money. It’s creating ongoing wealth out of your intellectual capital.”

The book (How to Think Like Leonardo da Vinci) is also very interesting. Well worth reading.