"Zen" means "to think about anything" and "arrive at the contemplation of" The purpose of the mini-garden of Zen - give you the "feel the moment", freeing up time from life's troubles and fleeting domestic troubles.
According to Eastern philosophy of Zen Buddhism is quintessence. Garden symbolizes the excitement and serenity that can instill a sense of grandeur to the owner and the balance through the contemplation of stones and sculptures.
It is believed that Zen meditation promotes relaxation and in the modern world is fleeting. Your movements become serene, freeing the mind, giving inspiration and creativity. When contemplating a mini-garden of Zen it is possible to feel a new kind of relaxation that allows you to draw upon the harmony and splendor - and in my heart and in mind.
(http://en.wikipedia.org/wiki/Zen)
http://en.wikipedia.org/wiki/Japanese_rock_garden