Onur Cobanli explains:
Many good designs are created unconsciously; all you need is to let your mind have the necessary ingredients; you need good research to start with, followed by igniting your brain by thinking hard on the design itself; and then a good sleep, good food and doing something totally irrelevant to give your mind some space and time to do its magic, all in all so that your design comes to you. The best material for any sort of good design is research and wisdom.