Learning from creative geniuses in history

Pablo Picasso, Albert Einstein, Leonardo Da Vinci, Wolfgang Amadeus Mozart, Galileo Galilei, Thomas Edison ... What do you think about by looking at these names?

Yes, they accomplish amazing stuff that remain in our history. We learn what they have accomplished. We admire them as geniuses. 

What we don't talk enough is HOW they came up those ideas that we now regard as great discovery, invention, or art works. Surprisingly, there are one common thing that all of these creative geniuses have done upon innovating.

They combined two or more unrelated matters and produced new ideas. Instead of being trapped in their own thinking patterns, they actively sought out creating