Three lenses on the same library
Mare organises the same archive three ways at once: Balanced (subject and category), Aesthetic (mood and colour), and Semantic (underlying theme), with a Recluster that re-runs them as the library grows. "Similar" isn't one thing: two references can share a subject but not a mood, or a mood but not a subject. Three labelled lenses keep that legible; a single "similarity" dial would flatten it into one axis that's wrong half the time.