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• 2 · Nature
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• 2 · Nature

21 · the four elements, and ether, the fifth element

• 21A · air (one of the four elements)
• 21B · earth (one of the four elements)
• 21C · fire (one of the four elements)
• 21D · water (one of the four elements)
• 21E · ether as 'quinta essentia'
• 210 · 'Elementi', 'Elementi secondo Empedocle' (Ripa)
• 21(+0) · the four elements, and ether, the fifth element (+ variant)