This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionBirapporto-architettura.jpg
العربية: الإنشاءات الهندسية للرباعية التوافقية على واجهة معمارية
Geometric construction of a harmonic range on an architectural facade using projective methods (Steiner’s method).
Costruzione geometrica della quaterna armonica su una facciata mediante procedimento proiettivo
https://isawi.blogspot.com/2026/02/cross-ratio-birapporto.html
Schema che illustra la determinazione dei punti armonici e
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.