You always need to be able to cut through stuff. A small knife with a black hilt that fits neatly into the palm of the hand and short sharp blade that can cut anything required. A blade, one of the earliest things modern humans adapted and still vital. A useful too but made beautifully.
Detachment requires a cut at times.
A dongle: this belongs somewhere close to hand. Access to knowledge, information, people. A small device that transports through space to the resources you need. It is red because I started loving words very early on and this gives me access to infinite quantities.
To me they are both little miracles of utility.