The Paradise Garden, or Chahar bagh was a classic garden form in ancient Persia with a central water source, and four water channels flowing out of it, north, south, east and west, representing the four rivers of paradise (water, wine, honey, and milk).
Plan of a Chahar bagh Image Source
The form of the Chahar bagh was the inspiration for the gardens at the Taj Mahal, in 1632 in India. In the photo, you can see the central water source and four out-flowing channels.
Taj Mahal, 1632 Image Source
In Medieval and Renaissance Europe, walled cloister gardens became closely associated with the culturally important virtues of purity and chastity in women, and thus with the most holy of chase women, the Virgin Mary. She was often painted in a walled garden.
Leonardo da Vinci Annunciation, oil on panel, 1472
And in Ming Dynasty China (1368-1644) the important Temple of Heaven Garden was built, full of the motifs of circle, representing heaven, and square, representing earth, as if to say a garden is where heaven and earth mingle.
Temple of Heaven Garden, 1420 image source
What feelings are evoked in you by gardens? Think about formal gardens, personal gardens, botanical gardens... how is their structure symbolic or evocative?