Instructions state that the pattern uses stranded colorwork, but Intarsia seems more probable.

Japanese version available here. Both English and Japanese versions are fully charted using standard knitting and/or crochet symbols.

Tools/Materials:

• Japanese size 8 knitting needles (4.5mm)
• 220g (1122m) color 1
• 10g (51m) color 2
• 15g (76.5m) color 12

Note: entire shawl worked with yarn held doubled.