~~30 Units~~ ~Paper used is 2:3 ratio rectangle.~ You can find a tutorial on how to cut square paper into proper size for this kusudama here - ... A tutorial on how to make the Whirlpool kusudama designed by Ekaterina
by Mr.Paper Crafts
by Golden Fire Origami
by Henry Phạm - Origami Tutorials
by MR. CREATOR
by EasyCrafts DIY
by Craft Haven
by Origami Diana