Fruit color is a factor intimately associated with fruit maturity. The small child uninstructed in the arts is not attracted to the cherry tree until the fruits are colored, and he soon learns from experience to choose the fruits that are sweetest by his sense of color values associated with the perception of taste.
Picking apples is a specialized operation for which there is a special technique. Inexperienced pickers do not have this technique but can acquire it. How well they do so and how quickly they become smooth pickers depends largely upon how painstakingly the orchardist and foreman teach them in the beginning. To fail here may mean to fail completely.