What creates the rhetorical effect in tajāhul al-ʿārif?

Tawjīh, Serious Intent in Jest, Feigned Ignorance, Qawl bi-l-Mūjib and Iṭrād

• Changing the case of a word
• Casting a known fact as uncertain or questioned for a purpose
• Using two rhymes in every verse
• The fact actually being unknown