Thanks to all who 'liked' or even took the time to look closely at this banner, and special thanks to
@Fleur569 and
@lauriemorningglory for the added acorns.
Although sunken gardens are typically created as a way to keep roots of plants cooler and wetter than allowed at ground level, any viewer of such a garden, seeing it from above, must realize that they also provide viewing perspectives that are well suited to formal designs. The patterns in this garden really stood out when viewed from above. Here's my source photo.