- The Sagrada Família's design is guided by a proportional system based on the number 12 and a 7.5-meter module.
- Mathematician Claudi Alsina discovered that ratios between divisors of 12 (like 1:4, 1:3, 1:2) explain much of the basilica's proportions.
- Key dimensions of the temple, including length (90m), width (60m), and various heights, are multiples of 7.5m.
- Towers feature polyhedral shapes, such as dodecahedrons, truncated octahedrons, and cubes, with symbolic elements like a 12-pointed star.
- Structural elements include catenary arches and double-helix torsion columns, optimized for load-bearing and light projection.
- Hidden symbolic features include a heptagonal canopy representing the seven gifts of the Holy Spirit and a magic square summing to 33.