Curling is the sport of high human development countries because the fundamental activity of play requires a cultivation of fingerspitzengefuhl adequate to the chaotic interaction of micro-friction. Such a cultivation is time-intensive and emerges from environments that support similar fingerspitzengefuhl kinds of human development, such as open heart surgery or mastery of the violin.
Only the fully free and flourishing individual may truly respond to his or her fingertips' feeling.