How does Ross King use imagery in Brunelleschi's Dome: How a Renaissance Genius Reinvented Architecture?

Imagery:

"Bales of English wool - the finest in the world - were brought from monasteries in the Cotswolds to be washed in the river Arno, combed, spun into yarn, and woven on wooden looms, then dyed beautiful colors: vermilion, made from cinnabar gathered on the shores of the Red Sea, or a brilliant yellow procured from the crocuses growing in meadows near the hilltop town of San Gimignano. The result was the most expensive and most sought-after cloth in Europe."

"And it was this vision of a massive dome that seemed to rise heavenward without any visible means of support that for the next half century would both inspire and frustrate everyone involved with the project."