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In page Balthasar Behem Codex:

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This kind of illustration - showing the practice of trades - was a tradition with an iconographical history going back to late Roman astronomical texts showing the "Labours of the Months", pairing a characteristic activity of rural life with the astrological sign for that month. Historians of culture and art have shown that these illustrations sometimes reflect their iconographical traditions rather than actually depicting contemporary life with accuracy[citation needed].