In 1509, [b]Luca Pacioli[/b] make the construction of their [b][i]Alphabeto Dignissimo Antico[/i][/b], inside chapter 9 of [b][i]Divina Proportione. [br][/i][/b]The [b]S letter[/b] of this alphabet is sculpted on stone, in a modern water fountain at Granada, as a mathematics hommage. The S letter is the capital of the former name of that place, Sierpe on spanish.

The construction itself is quite laborius as it involves 15 major steps and several substeps in each passage. But we can easily follow with the navigation process.

With some minor differences, maybe a lack of the craftmen that carved the marble stone, The S is reconstructed like that: