woodworker, (kokuji)
杢 centers on a person who works with wood: a woodworker or carpenter. It is a kokuji, a kanji created in Japan specifically for this meaning.
杢 is a Japanese-made kokuji combining 木 (tree, wood) and 工 (work, craft) to represent a woodworker. It has no ancient Chinese origin.
A tree 木 and work 工 come together: a woodworker is someone who works with wood.
For もく, imagine a woodworker carving a mock-up of a tree: mock -> もく, and the woodworker shapes the wood.
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