The image shows an open book with a drawing of a person's hand holding a piece of wood, which appears to be a mortise joint.
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The image shows an open book with a drawing of a person's hand holding a piece of wood, which appears to be a mortise joint. The drawing is detailed and shows the person's fingers gripping the wood, as well as the joints of the wood. The text on the book provides further information about the joint, such as its size, shape, and texture.