It is doing so by breakingthe main design up in smaller sections that are filled with different patterns.
This technique is regarded as being part of the Kyo-nui ('Kyoto embroidery') tradition.
WV
Wari-Tsuke-Mon'yo-Nui
The wari-tsuke-mon'yo-nui ('allocated pattern stitch') is the Japanese term for an embroidery technique that gives an overall design more complexity.
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Embroidery stitches