For as long as I can remember — and certainly long before I had the term for it — I’ve believed that creativity is combinatorial: Alive and awake to the world, we amass a collection of cross-disciplinary building blocks — knowledge, memories, bits of information, sparks of inspiration, and other existing ideas — that we then combine and recombine, mostly unconsciously, into something “new.” From this vast and cross-disciplinary mental pool of resources beckons the infrastructure of what we call our “own”“original” ideas.................
Source Credit and full writeup at : https://www.brainpickings.org/2013/08/14/how-einstein-thought-combinatorial-creativity/