In a pointed window, a surprise arise when looking for the centers of the pointed archs:[br][br]They appears at [b]1/7 distance of clear span[/b] of the arch, from de center or from the sides, according to external or internal archs.

[math][/math]That gives to us the key for searching Pi in the windows. From ancient times (Arquímedes), the best approximation to Pi is 22/7:[br][br][math]\frac{22}{7}\simeq3.1428[/math][br][br]and we found that ratio in the windows itself, measured in units of the center distance.

So, the master gives a special sign on that window. A knowledge about Pi codifies by the key 1/7. None window appears that form or that manner. The probability to have it at random is really low. The message, far away the functionality of the window or the style is patent. Now, we are doing research in order to know what are the mathematical knowledge of the master stonemason, Juan García de Praves.