ExampleTwo termsCommon feature
Calf-shaped bodyBoth sensoryVisible similarity of form: sensory
Day stripped from nightSensory scenesSequence of removal and emergence: conceptual
The claim that any visible metaphor must have a sensory common feature is incorrect. The relevant feature is the one that justifies the figurative transfer, not merely any perceivable attribute of the relata.
Identify the source and target first; then specify precisely the shared relation that makes the borrowing appropriate.