Conjectures about the “man without attributes” ( f85r2 )

[RobGea]

Logic ( also dialectic ) is one of the trivium, a part of the studies in Liberal arts in Medieval education.

Dialectica from the Hortus deliciarum  Herrad of Landsberg, Abbess of Hohenburg, ca. 1180

Nice pointing gesture though her other hand is problematic because she holds a  barking dog's head  (and of course this MSS is a little early).
   

"Logic (also dialectic) is the "mechanics" of thought and of analysis,
the process of composing sound arguments and identifying fallacious arguments and statements,
...Its aim is to calculate what is certainly true or false. "

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Note,  grammatica (at 12 o'clock) holds a whip and a book :: the whip looks like one of the items in the hand of f86v4 west