Probably
the most-used, most-carefully-placed tool around here, the sketchbook.
Not to be lost. When one fills up, there are several new ones on hand,
ready to go. Small one for discreet sketching, at meetings or
whatnot. The spine of my latest sketchbook has developed leprosy or
something so I'm giving the spiral-bound a try. If the pages stay in
then I'll convert.