色调和质感

……当你看到一堵满是污点的墙时,你可能会发现它与各种各样的风景有着相似之处……或者你可能再次看到人物,或者奇怪的面孔,以及各种各样的。这些声音在这些墙壁上混乱地出现,就像钟声一样,在它的叮当声中,你可以找到任何你选择想象的名字或单词。

…when you look at a wall spotted with stains, you may discover a resemblance to various landscapes, beautified with mountains, rivers, rocks, trees…Or again you may see battles and figures in action, or strange faces and costumes and an endless variety of objects which you could reduce to complete and well-known forms. And these appear on such walls confusedly, like the sound of bells in whose jangle you may find any name or word you choose to imagine.

达芬奇 Leonardo da Vinci
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Francis D.K. Ching 《 Design Drawing 》