This article is about how to enjoy/appreciate beauty in terms of sculpture.
这篇文章是关于怎样欣赏雕塑的美.
课文开始: Appreciation of sculpture depends upon the ability to respond to form in three dimensions. ...
appreciation of sculpture 欣赏，理解雕塑
depend upon=depend on
口语多用 depend on，书面语多用 depend upon
respond to ...: 对…有一种反映能力 (后置定语)
接下来课文...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 colour-blind. ...
involve...: 与…有关 is concerned with...
接下来课文...The child learning to see, first distinguishes only two-dimensional shape; it cannot judge distances,depths. ...
distinguish=differ
接下来课文...Later, for its personal safety and practical needs, it has to develop(partly by means of touch) the ability to judge roughly three-dimensional distances. ...