Use 30 + 30 rectangle (1:2) sheets of origami paper.
Difficulty : ⭐⭐
Time: 1.5 hours
Simply divide Sonobe Unit in half, so that we can assign any color on the ball.
It also appears in Toshiaki Hojo's book (Japanese language).
Model paper size:
Half Unit (various colors) : 3.75 cm x 7.5 cm
Model height: ~7.5 cm
PrwOrigami - Kusudama Collection