The six principal purposes are identified through the listener's informational need and the speaker's intended impact.
PurposeIntended effectSource image
PossibilityRemove seeming impossibilityMusk and gazelle blood
StateDescribe a conditionSun and stars
DegreeSpecify intensityBlack raven's feather
ReinforcementEstablish a judgmentBroken glass
BeautificationMake attractiveGazelle's eye
DisparagementMake repellentSatirical gestures
Inverted simile is a special reversal of expected comparative roles, usually for intensified praise; it is not simply another informational need in the table.