Tools of self-defense or aggressive warfare, called weapons, frequently embody principles that can be constructively rather than destructively employed. Conversely, ballpoint pens, carried with us in our breast pockets because so frequently used, can be employed either constructively to write a life-saving prescription or destructively as a dagger. My eyeglasses and hearing aids together weigh only a quarter of a pound. The same tool can become the extensions of many individuals, and for longer years than human generations. Bridges and transcontinental highways are universally social tools.
Airplanes are mutually interchangeable human flying tools.
There are metaphysical as well as physical tools. Mathematics are metaphysical tools. Inter-relevant metaphysical informations are tools. Physical structures are tools. Mathematics makes possible the synergetic organization of metaphysical information which can be progressively objectivized as pattern-controlling or evolving tools systems which can advantageously alter the physical environmental circumstances of human existence.