Leonardo da Vinci's Drawing Materials from Royal Collection Trust on Vimeo.
It reminded me quite a bit of preparing for a campaign or gaming session as a DM. Now, I don't want to draw some sort of absurd parallel between a gaming session and the work of da Vinci. I just mean that there is something similar in the procedure: the careful creation of mundane materials from which something much more interesting will spring. The careful time and effort devoted to simply setting up a framework for something better.