the.com/playfulness
The serious business of doing things for no reason but joy.
means A lighthearted, spontaneous quality of approaching life with humor, curiosity, and a willingness to not take things too seriously.
from From play, rooted in Old English plegan, to frolic or exercise briskly, plus the suffix -ful, full of, and -ness, the state of — literally full of frolic.
Survival toolAnimals that play develop sharper brains and social skills.
Not childishAdults who play age slower and stress less.
Innovation fuelMany breakthroughs began as someone messing around.