LCM (Lowest Common Mulitple), HCF (Highest Common Factor) are the only memory of my primary school.

because those are the things I used everydays in my life...

observing the common factors of different objects, extract it, you would find a new raw-er object.

so, human would have periodic table, would have H₂O, this is an important mindset to understand the world...
(however, atoms are just "a smallest" thing observable in a finite era)

anyway, despite of physicial observables, we can go pathological, psychological, philosophical, scientifical, xxx-ical...

and then, if you like, we could combine those factors... to "refactor" or so called "create"