The Practice and Science Of Drawing
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III VISION

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It is necessary to say something about Vision in the first place, if we are to have any grasp of the idea of form.

An act of vision is not so simple a matter as the student who asked her master if she should "paint nature as she saw nature" would seem to have thought. And his answer, "Yes, madam, provided you don't see nature as you paint nature," expressed the first difficulty the student of painting has to face: the difficulty of learning to see.

Let us roughly examine what we know of vision. Science tells us that all objects are made visible to us by means of light; and that white light, by which we see things in what may be called their normal aspect, is composed of all the colours of the solar spectrum1, as may be seen in a rainbow; a phenomenon caused, as everybody knows, by the sun's rays being split up into their component2 parts.

This light travels in straight lines and, striking objects before us, is reflected in all directions. Some of these rays passing through a point situated3 behind the lenses of the eye, strike the retina. The multiplication4 of these rays on the retina produces a picture of whatever is before the eye, such as can be seen on the ground glass at the back of a 39photographer's camera, or on the table of a camera obscura, both of which instruments are constructed roughly on the same principle as the human eye.

These rays of light when reflected from an object, and again when passing through the atmosphere, undergo certain modifications6. Should the object be a red one, the yellow, green, and blue rays, all, in fact, except the red rays, are absorbed by the object, while the red is allowed to escape. These red rays striking the retina produce certain effects which convey to our consciousness the sensation of red, and we say "That is a red object." But there may be particles of moisture or dust in the air that will modify the red rays so that by the time they reach the eye they may be somewhat different. This modification5 is naturally most effective when a large amount of atmosphere has to be passed through, and in things very distant the colour of the natural object is often
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1 spectrum Trhy6     
n.谱，光谱，频谱；范围，幅度，系列
参考例句：
  • This is a kind of atomic spectrum.这是一种原子光谱。
  • We have known much of the constitution of the solar spectrum.关于太阳光谱的构成，我们已了解不少。
2 component epSzv     
n.组成部分，成分，元件；adj.组成的，合成的
参考例句：
  • Each component is carefully checked before assembly.每个零件在装配前都经过仔细检查。
  • Blade and handle are the component parts of a knife.刀身和刀柄是一把刀的组成部分。
3 situated JiYzBH     
adj.坐落在...的，处于某种境地的
参考例句：
  • The village is situated at the margin of a forest.村子位于森林的边缘。
  • She is awkwardly situated.她的处境困难。
4 multiplication i15yH     
n.增加，增多，倍增；增殖，繁殖；乘法
参考例句：
  • Our teacher used to drum our multiplication tables into us.我们老师过去老是让我们反覆背诵乘法表。
  • The multiplication of numbers has made our club building too small.会员的增加使得我们的俱乐部拥挤不堪。
5 modification tEZxm     
n.修改，改进，缓和，减轻
参考例句：
  • The law,in its present form,is unjust;it needs modification.现行的法律是不公正的，它需要修改。
  • The design requires considerable modification.这个设计需要作大的修改。
6 modifications aab0760046b3cea52940f1668245e65d     
n.缓和( modification的名词复数 )；限制；更改；改变
参考例句：
  • The engine was pulled apart for modifications and then reassembled. 发动机被拆开改型，然后再组装起来。 来自《简明英汉词典》
  • The original plan had undergone fairly extensive modifications. 原计划已经作了相当大的修改。 来自《简明英汉词典》
7 entirely entirely     
ad.全部地，完整地；完全地，彻底地
参考例句：
  • The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
  • His life was entirely given up to the educational work. 他的一生统统献给了教育工作。
8 atmospheric 6eayR     
adj.大气的，空气的；大气层的；大气所引起的
参考例句：
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
9 perfectly 8Mzxb     
adv.完美地，无可非议地，彻底地
参考例句：
  • The witnesses were each perfectly certain of what they said.证人们个个对自己所说的话十分肯定。
  • Everything that we're doing is all perfectly above board.我们做的每件事情都是光明正大的。
10 complexity KO9z3     
n.复杂(性)，复杂的事物
参考例句：
  • Only now did he understand the full complexity of the problem.直到现在他才明白这一问题的全部复杂性。
  • The complexity of the road map puzzled me.错综复杂的公路图把我搞糊涂了。
11 possessed xuyyQ     
adj.疯狂的；拥有的，占有的
参考例句：
  • He flew out of the room like a man possessed.他像着了魔似地猛然冲出房门。
  • He behaved like someone possessed.他行为举止像是魔怔了。
12 perennial i3bz7     
adj.终年的；长久的
参考例句：
  • I wonder at her perennial youthfulness.我对她青春常驻感到惊讶。
  • There's a perennial shortage of teachers with science qualifications.有理科教学资格的老师一直都很短缺。
13 touching sg6zQ9     
adj.动人的，使人感伤的
参考例句：
  • It was a touching sight.这是一幅动人的景象。
  • His letter was touching.他的信很感人。
14 precipice NuNyW     
n.悬崖，危急的处境
参考例句：
  • The hut hung half over the edge of the precipice.那间小屋有一半悬在峭壁边上。
  • A slight carelessness on this precipice could cost a man his life.在这悬崖上稍一疏忽就会使人丧生。
15 cone lYJyi     
n.圆锥体，圆锥形东西，球果
参考例句：
  • Saw-dust piled up in a great cone.锯屑堆积如山。
  • The police have sectioned off part of the road with traffic cone.警察用锥形路标把部分路面分隔开来。
16 beholder 8y9zKl     
n.观看者，旁观者
参考例句：
  • Beauty is in the eye of the beholder. 看起来觉得美就是美。 来自《简明英汉词典》
  • It has been said that art is a tryst, for in the joy of it maker and beholder meet. 有人说艺术是一种幽会，因为艺术家和欣赏者可在幽会的乐趣中相遇在一起。 来自《简明英汉词典》
17 purely 8Sqxf     
adv.纯粹地，完全地
参考例句：
  • I helped him purely and simply out of friendship.我帮他纯粹是出于友情。
  • This disproves the theory that children are purely imitative.这证明认为儿童只会单纯地模仿的理论是站不住脚的。
18 instinctively 2qezD2     
adv.本能地
参考例句：
  • As he leaned towards her she instinctively recoiled. 他向她靠近，她本能地往后缩。 来自《简明英汉词典》
  • He knew instinctively where he would find her. 他本能地知道在哪儿能找到她。 来自《简明英汉词典》
19 scribbling 82fe3d42f37de6f101db3de98fc9e23d     
n.乱涂[写]胡[乱]写的文章[作品]v.潦草的书写( scribble的现在分词 )；乱画；草草地写；匆匆记下
参考例句：
  • Once the money got into the book, all that remained were some scribbling. 折子上的钱只是几个字！ 来自汉英文学 - 骆驼祥子
  • McMug loves scribbling. Mama then sent him to the Kindergarten. 麦唛很喜欢写字，妈妈看在眼里，就替他报读了幼稚园。 来自互联网
20 savage ECxzR     
adj.野蛮的；凶恶的，残暴的；n.未开化的人
参考例句：
  • The poor man received a savage beating from the thugs.那可怜的人遭到暴徒的痛打。
  • He has a savage temper.他脾气粗暴。
21 remarkable 8Vbx6     
adj.显著的，异常的，非凡的，值得注意的
参考例句：
  • She has made remarkable headway in her writing skills.她在写作技巧方面有了长足进步。
  • These cars are remarkable for the quietness of their engines.这些汽车因发动机没有噪音而不同凡响。
22 pointed Il8zB4     
adj.尖的，直截了当的
参考例句：
  • He gave me a very sharp pointed pencil.他给我一支削得非常尖的铅笔。
  • She wished to show Mrs.John Dashwood by this pointed invitation to her brother.她想通过对达茨伍德夫人提出直截了当的邀请向她的哥哥表示出来。
23 elevations cb4bbe1b6e824c996fd92d711884a9f2     
（水平或数量）提高( elevation的名词复数 )； 高地； 海拔； 提升
参考例句：
  • Weight of the crust changes as elevations are eroded and materials are deposited elsewhere. 当高地受到侵蚀，物质沉积到别的地方时，地壳的重量就改变。
  • All deck elevations are on the top of structural beams. 所有甲板标高线均指结构梁顶线。
24 projections 7275a1e8ba6325ecfc03ebb61a4b9192     
预测( projection的名词复数 )； 投影； 投掷； 突起物
参考例句：
  • Their sales projections are a total thumbsuck. 他们的销售量预测纯属估计。
  • The council has revised its projections of funding requirements upwards. 地方议会调高了对资金需求的预测。
25 relegated 2ddd0637a40869e0401ae326c3296bc3     
v.使降级( relegate的过去式和过去分词 )；使降职；转移；把…归类
参考例句：
  • She was then relegated to the role of assistant. 随后她被降级做助手了。
  • I think that should be relegated to the garbage can of history. 我认为应该把它扔进历史的垃圾箱。 来自《现代汉英综合大词典》
26 brotherhood 1xfz3o     
n.兄弟般的关系，手中情谊
参考例句：
  • They broke up the brotherhood.他们断绝了兄弟关系。
  • They live and work together in complete equality and brotherhood.他们完全平等和兄弟般地在一起生活和工作。
27 poetic b2PzT     
adj.富有诗意的，有诗人气质的，善于抒情的
参考例句：
  • His poetic idiom is stamped with expressions describing group feeling and thought.他的诗中的措辞往往带有描写群体感情和思想的印记。
  • His poetic novels have gone through three different historical stages.他的诗情小说创作经历了三个不同的历史阶段。
28 artistic IeWyG     
adj.艺术(家)的，美术(家)的；善于艺术创作的
参考例句：
  • The picture on this screen is a good artistic work.这屏风上的画是件很好的艺术品。
  • These artistic handicrafts are very popular with foreign friends.外国朋友很喜欢这些美术工艺品。
29 fiery ElEye     
adj.燃烧着的，火红的；暴躁的；激烈的
参考例句：
  • She has fiery red hair.她有一头火红的头发。
  • His fiery speech agitated the crowd.他热情洋溢的讲话激动了群众。
30 intensity 45Ixd     
n.强烈，剧烈；强度；烈度
参考例句：
  • I didn't realize the intensity of people's feelings on this issue.我没有意识到这一问题能引起群情激奋。
  • The strike is growing in intensity.罢工日益加剧。
31 symbolic ErgwS     
adj.象征性的，符号的，象征主义的
参考例句：
  • It is symbolic of the fighting spirit of modern womanhood.它象征着现代妇女的战斗精神。
  • The Christian ceremony of baptism is a symbolic act.基督教的洗礼仪式是一种象征性的做法。
32 deplored 5e09629c8c32d80fe4b48562675b50ad     
v.悲叹，痛惜，强烈反对( deplore的过去式和过去分词 )
参考例句：
  • They deplored the price of motor car, textiles, wheat, and oil. 他们悲叹汽车、纺织品、小麦和石油的价格。 来自辞典例句
  • Hawthorne feels that all excess is to be deplored. 霍桑觉得一切过分的举动都是可悲的。 来自辞典例句
33 faculty HhkzK     
n.才能；学院，系；(学院或系的)全体教学人员
参考例句：
  • He has a great faculty for learning foreign languages.他有学习外语的天赋。
  • He has the faculty of saying the right thing at the right time.他有在恰当的时候说恰当的话的才智。
34 utilitarian THVy9     
adj.实用的，功利的
参考例句：
  • On the utilitarian side American education has outstridden the rest of the world.在实用方面美国教育已超越世界各国。
  • A good cloth coat is more utilitarian than a fur one.一件优质的布外衣要比一件毛皮外衣更有用。
35 enjoyment opaxV     
n.乐趣；享有；享用
参考例句：
  • Your company adds to the enjoyment of our visit. 有您的陪同，我们这次访问更加愉快了。
  • After each joke the old man cackled his enjoyment.每逢讲完一个笑话，这老人就呵呵笑着表示他的高兴。
36 inverted 184401f335d6b8661e04dfea47b9dcd5     
adj.反向的，倒转的v.使倒置，使反转( invert的过去式和过去分词 )
参考例句：
  • Only direct speech should go inside inverted commas. 只有直接引语应放在引号内。
  • Inverted flight is an acrobatic manoeuvre of the plane. 倒飞是飞机的一种特技动作。 来自《简明英汉词典》
37 rambling MTfxg     
adj.[建]凌乱的，杂乱的
参考例句：
  • We spent the summer rambling in Ireland. 我们花了一个夏天漫游爱尔兰。
  • It was easy to get lost in the rambling house. 在布局凌乱的大房子里容易迷路。
38 apprehended a58714d8af72af24c9ef953885c38a66     
逮捕，拘押( apprehend的过去式和过去分词 )； 理解
参考例句：
  • She apprehended the complicated law very quickly. 她很快理解了复杂的法律。
  • The police apprehended the criminal. 警察逮捕了罪犯。
39 derived 6cddb7353e699051a384686b6b3ff1e2     
vi.起源；由来；衍生；导出v.得到( derive的过去式和过去分词 )；（从…中）得到获得；源于；（从…中）提取
参考例句：
  • Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
  • He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》
40 primitive vSwz0     
adj.原始的；简单的；n.原(始)人，原始事物
参考例句：
  • It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
  • His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。
41 secondly cjazXx     
adv.第二，其次
参考例句：
  • Secondly,use your own head and present your point of view.第二，动脑筋提出自己的见解。
  • Secondly it is necessary to define the applied load.其次，需要确定所作用的载荷。
42 mosaic CEExS     
n./adj.镶嵌细工的，镶嵌工艺品的，嵌花式的
参考例句：
  • The sky this morning is a mosaic of blue and white.今天早上的天空是幅蓝白相间的画面。
  • The image mosaic is a troublesome work.图象镶嵌是个麻烦的工作。
43 inversely t4Sx6     
adj.相反的
参考例句：
  • Pressure varies directly with temperature and inversely with volume. 压力随温度成正比例变化，与容积成反比例变化。 来自《简明英汉词典》
  • The amount of force needed is inversely proportional to the rigidity of the material. 需要的力度与材料的硬度成反比。 来自《简明英汉词典》
44 portrayed a75f5b1487928c9f7f165b2773c13036     
v.画像( portray的过去式和过去分词 )；描述；描绘；描画
参考例句：
  • Throughout the trial, he portrayed himself as the victim. 在审讯过程中，他始终把自己说成是受害者。
  • The author portrayed his father as a vicious drunkard. 作者把他父亲描绘成一个可恶的酒鬼。 来自《现代汉英综合大词典》
45 expressive shwz4     
adj.表现的，表达…的，富于表情的
参考例句：
  • Black English can be more expressive than standard English.黑人所使用的英语可能比正式英语更有表现力。
  • He had a mobile,expressive,animated face.他有一张多变的，富于表情的，生动活泼的脸。

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