1) Divide a 29 cm mari into a C8. Now turn your mari so that
you're looking at one of the diamond or kite shapes. It should
have 4 spokes. You will add two extra complete wraps around the
mari, each bisecting the diamond. This will give you 8 spokes.
Then, to add the rest of the spokes, you'll have to zigzag your way
around the ball, taking a stitch at each intersection. When
you're finished, you will have 12 equal (well, in my case mostly
equal ) diamonds, each with 12 spokes.

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2) Measure and pin 2/3 out from the center of each diamond on all
spokes. Measure out 1 cm from the center on alternate
spokes. (I pinned and stitched one kiku at a time to avoid
tangles.) Thread your needle with your first color. Use
double thread. Choose a beginning pin and stitch one round of a
kiku, making sure your double thread lies flat. (It helps to pull your
thread pretty tight and use your thumb to hold it down snugly as you
stitch.) Pin the spokes you haven't stitched yet and keep on
going! Repeat this twice, once in each of your two other
colors. Make sure you take your last stitches as close to the
edge of the marker threads as you can. Stitch the remaining 11
(!) kikus.
3) For the outlining, thread your needle with a long length of double
thread in your fourth color. Turn your temari so that you're
looking at 3 kikus - one lying horizontally at the top with the other
two tilting at an angle underneath. Can you see the rounded
triangle surrounding these three?
Begin your stitching at a point where the marker threads
intersect. Take your thread around this triangle inside the
marker lines of your diamonds. Repeat this process, turning and
always orienting yourself to this 3-kiku pattern. Your threads
will begin to intersect. Where they do, weave them first over,
then under the adjacent threads. You're all done!