Task 6　　paitings were not perspective which means flat lacking dimensions before the renaissance,　　but after the renaissance, several methods were used that helped the paintings look more perspective and realistic, 但是只是作者推测　　1.artists began using optical devices such as camera or mirrors, for example, to draw a bow of fruit, they can use mirror to reflect the image on canvas, then trace the lines,最后一句不记得了　　2.artists began using special paint oils, which takes more time to dry, the artist could pay more attention to details, which also makes the painting more perspective　　question: 文艺复兴后画家们用了哪些办法让油画更立体？　　一个艺术史的讲座，基本没听懂，看到题才知道是讲的从文艺复兴到现实主义过渡中的两个理论，一个是用反射什么的，camera什么的，说了一堆我没听懂。还有一个是油画oil painting。画的可以很慢，所以可以有时间描绘细节，什么时候觉得画好了什么时候停