Behind the large aviary, a slight imprint in the grass presents the same circular form as one that can be seen inside the fattoria building. This "negative" image in grass suggests that the stones arranged in the fattoria might have once been found here, or may even have been extracted from the outdoor site.
For the viewer, seeing both of the works becomes an exercise of memory, which inevitably provokes association of the two images and discovery of the many subtle messages they send.