Kusudama of Flowers by Makoto Yamaguchi
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Designer: Makoto Yamaguchi
In Kusudama: Ball Origami (amazon) (76 pages, 1990) by Makoto Yamaguchi.
Paper that is colored on both sides is recommended for this model. Otherwise, individual flowers look very pretty but the whiteness that shows in the kusudama is jarring (as in the picture above).