Yeah. It's the diagram that was done by Lodovico Cardi. I studied Renaissance art history in Italy a couple of years ago, and Brunelleschi and the dome were my main presentation (I also did presentations on Nicola and Giovanni Pisano and Caravaggio). Brunelleschi was a fucking GENIUS. Have you read Brunelleschi's Dome by Ross King? It's excellent. Very well-written, engaging- reads almost more like a novel- and not terribly long.