锥画沙形容书法“中锋”、“藏锋”之妙。画沙,言锥锋画入沙里,沙形两边凸起,中间凹成一线。比喻用笔功夫精深,下笔有力,既稳且准。唐褚遂良《论书》中首先提出“用笔当如锥画沙”。唐颜真卿《述张长史笔法十二意》云:“长史曰:‘予传授笔法,得之于老舅彦远曰:吾昔日学书,虽功深,奈何迹不殊妙。后问于褚河南,曰:用笔当须如印印泥。思而不悟,后于江岛,遇见沙平地静,令人意悦欲书,乃偶以利锋画而书之,其劲险之状,明利媚好。自茲乃悟用笔如锥画沙,使其藏锋,画乃沉着。当其用笔,常欲使其透过纸背,此功成之极矣。真草用笔,悉如画沙,点画净媚,则其道至矣。如此则其迹可久,自然齐于古人。但思此理,以专想功用,故其点画不得 Cone painting sand to describe the calligraphy ”center “, ”hidden front “ wonderful. Painted sand, Yan cone into the sand front, raised on both sides of the sand shape, the middle concave line. Analogy with pen deep, pen strong, both steady and accurate. Tang Chu Sui-liang, ”Book“ first proposed ”use the pen as the cone painting sand.“ Tang Yan Zhenqing ”Zhang Chang Shi strokes Twelve meaning“: ”Long history said: ’To teach pen law, obtained from the old uncle Yan said: My past study books, although Gongshennaimangnai trace is not wonderful. Asked in Chu Henan, said: pen should be as Indian ink .Continuosiwu, after the island of Jiang, met sand flat to the earth, it is intended to pleasing to the book, is even to draw the book and Li Feng, the risk of Shape, bright and good pro.Because it is awkward to use a pen as a cone sand painting, making it hidden front, painting is calm .When the pen, often want to make it through the back of the paper, this is extremely successful. , Is familiar with the sand, dotted net Mei, then the road to carry on. So traceable for a long time, naturally homogeneous in the ancients.