The image in the question is from Wikimedia Commons https://commons.wikimedia.org/wiki/File:Florence_Duomo_from_Michelangel…
Attributed to: Petar Milošević
License: Creative Creative Commons Attribution-Share Alike 4.0 International
The image in the Explanation is from Wikimedia Commons https://commons.wikimedia.org/wiki/File:Florence_duomo_fc10.jpg
Attributed: Fczarnowski
License: Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
For more information about the Duomo:
From Wikipedia:https://en.wikipedia.org/wiki/Florence_Cathedral
From Opera di Santa Maria del Fiore: https://duomo.firenze.it/en/discover/dome
For more information about Brunellesci:
From Wikipedia: https://en.wikipedia.org/wiki/Filippo_Brunelleschi
From MacTutor: https://mathshistory.st-andrews.ac.uk/Biographies/Brunelleschi/
From Britannica: https://www.britannica.com/biography/Filippo-Brunelleschi