I, discovered, that:

This humble sketch illustrates what I'm talking about: Starting from a square of dimensions** a** x **a**, take the diagonal of the sqaure **b** and draw an arch on one of the diagonals starting points, which obviously its radius is **b**. Extend one of the sqaure's sides and draw a new side on the point of intersection. This new rectangle will have the proportion of 1 to square root of 2 (which is 1.414~). This rectangle, is the Silver Proportion. Which is the proportion of a ~~good~~ great A4 sheet of paper.

!

I respect A4s now!