练习材料：
[Day 1778 2019-08-09]
Lesson 31-1The sculptor speaks
Appreciation of sculpture depends upon the ability to respond to form in three
dimensions. That is perhaps why sculpture has been described as the most difficult of
all arts; certainly it is more difficult than the arts which involve appreciation of flat
forms, shape in only two dimensions. Many more people are 'form-blind' than colourblind. The child learning to see, first distinguishes only two-dimensional shape; it
cannot judge distances, depths. Later, for its personal safety and practical needs, it has
to develop (partly by means of touch) the ability to judge roughly three-dimensonal
distances. But having satisfied the requirements of practical necessity, most people go
no further.
任务配置：L0+L1+L4
知识笔记：
form-blind 形状盲板
colourblind 网络 色盲;
necessity n. 必然; 必要; 需要; 必需的事物; 必需品; 必然性; 不可避免的情况;
练习感悟：
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