A 3D model of the solar system, driven by the sun's gravitation pull.
The solar system does not look like a flat spinning mobile. The sun hold 99.8% of the mass in the solar system and it's gravity keeps every planet , asteroid and comet locked in orbit around it.
Why is A4 paper 297×210 mm?
Math! Ratio = √2 ≈ 1.414213562 so folding preserves proportions.
Let r = L/W. Halve long side: new ratio = 2/r. Set r = 2/r → r² = 2 → r = √2!
A0 = 1 m². Beautiful design!