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How do you prune a shrub to a spherical shape?

I have a mature corea (Australian native) shrub, which was really straggly, but I have pruned back into order. There's a main section left, which is healthy and gets good light etc. It is reasonably uniformly filled with foliage, and I'd like to make more of a feature of it by pruning it into a spherical shape of approx 1 metre (3 ft) topiary-style.

What's the best way to prune it to an exact spherical shape?

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