REACHING blearily, in the morning, for a pair of socks, few people give a thought to the smooth running of a drawer.

• 早上，当人们眯着惺忪的睡眼，拉开抽屉找袜子时，少有人会去留意推拉抽屉的过程中那种灵活自如顺畅无碍的感觉。