The following distinctions help identify an actual sensory point of likeness.
SensePossible shared feature
SightRedness, roundness, length, visible movement
HearingLoudness or softness of sound
TasteSweetness, bitterness, sourness
SmellPleasant or unpleasant scent
TouchHeat, coldness, smoothness, hardness
The purpose is to identify which sense gives direct access to the sensory feature. When a quality is known only through reasoning or an ethical judgment, it belongs to a different analysis.