Why can Italy form the secular culture of its citizens?

(13-14th century)13rd century14th century, great changes have taken place in Italy's politics, economy and culture. As the Crusades dredged the trade routes in the Mediterranean region, Italy's geographical position was important, which manipulated the trade between East and West. Florence, Siena, Venice and other cities have seen a large number of centralized and decentralized workshops and handicraft workshops, forming a large number of citizen classes, and also began to form a secular culture of citizens centered on the city. There is also a new trend in plastic arts. Although it is closely related to the tradition of Gothic art, the universal concern for ancient Roman art is an important factor to produce new forms of expression.