The source and target of a metaphor can both be perceptible, both conceptual, or of different kinds. The decisive analytical issue is the shared respect.
Sensory: brilliance shared by a bright object and the sun.
Conceptual: the guiding function shared by a teacher and a lamp.
Mixed: “a wound in the heart,” transferring bodily injury to emotional suffering.
A concrete borrowed expression can convey an intellectual relation; the nature of its source noun alone does not determine the type of resemblance.