~~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 Origami Art
by Sekedar Berbagi
by All About Easy Craft Ideas
by Arthur 3D origami
by RJ CRAFTS
by How to Make Origami