structuring math at the primary school level

• 1. Point : intuition of existential quantifier. D0
• 2. Line : intuition of physical tension. D1
• 3. Circle : intuition of planarity. D2
• 3.1. Radian : intuition of angular ratio. D2
• 2.1. Right-angle : intuition of physical compression. D2
• 2.2. Hypotenuse : intuition of loss minimisation. D2
• 4. Numbering : intuition of linear ratio. D1
• 4.1. Trigonometric ratios : intuition of complex plane. D4
• 5. Spirograph : intuition of modular forms. 

... some notes on structuring math at the primary school level. It turns out that throwing symbols at kids is a lot harder to digest than throwing reified geometry.