• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

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• 2 · Nature
• 23 · time
• 23K · the twelve months represented by scenes showing human activities, usually in a landscape; so-called 'labours of the months'
• 23K2 · the months of the second quarter of the year ~ human activities (the 'labours' of April, May and June)
• 23K21 · April and its 'labours'

23K21(+1) · April and its 'labours' (+ with zodiacal signs)