Sit in any waiting room. A doctor, dentist, or car inspection garage where you have absolutely nothing to do for about an hour. Or take a flight with no Wi-fi, and no leg room. Get stuck in traffic. Make sketches on a very small lined pad (even a napkin will do) with a good pen. The worse the environment, the better the result! Your mind will really wander and open up the playground.

Paula Scher, 10 rules for play