I can't quite put my finger on it, but there is something that is intrinsically satisfying about organizing things. Maybe it's because I love to knoll (the art of arranging things in parallel lines or 90 degree angles) or that I enjoy keeping things clean, minimal, uncomplicated.
I believe that there is a poetic nature to the physical space that surrounds us; it's a powerful force that shapes our behaviour, emotions and beliefs.
I usually don't leave the door without these few items (and, not pictured: a pen and a note/sketchbook). Aside from acting as time capsules, they help to keep me organized.