Living in the city, do you still notice the change of the season? Our calendars are no more than a series of numbers. The true reminder is the nature around you. That is why nature is so visually important for the city people. You know spring comes when the trees are covered with new light green; you know fall is about to end when all the yellow leaves have fallen on the wet ground. Nature makes us more sensitive to the tiny little changes around us, it also let us cherish time and life.