The idea here is that an emptiness of Being which is prepared to receive these feeling-impressions of the garden in a new way has a reciprocal action on the garden itself: it creates an order of understanding within the nature of freedom. All of the actions within the garden are a reflection of this. Inner emptiness paradoxically begets an outer order that has an extraordinarily beautiful flexibility contained within an intelligent structure. There is more than a whiff of the sacred in all of this; and indeed, there are connections between this inner and outer juxtaposition in Zen, and the action of Holy Communion as it's understood in Christianity.
More on that later.