仙人掌绘制练习
原文链接：https://tabithaannthelostsock.blogspot.com/2014/09/how-to-practice-cactus.html
日期： 2014-09-16
标签： art, cactus, contour lines, Desert, elementary, how to draw, lesson plans, plants, western
想象一个地球仪……
有一些线条从顶部的北极点延伸至底部的南极点。
当你处于赤道视角时，你会看到一条垂直的直线贯穿地球仪中央。
这条直线右侧的每条线都向右弯曲，左侧的每条线都向左弯曲。
它们的弯曲程度逐渐增大，直至抵达地球的边缘。
请看下方的小仙人掌？
它也遵循同样的规律。
这条直线右侧的每条线都向右弯曲，左侧的每条线都向左弯曲。
它们的弯曲程度逐渐增大，直至抵达仙人掌的边缘。
这些线条被称为
轮廓线（CONTOUR LINES）。
你可以在二维形状上画出这些线条，从而将其转化为三维形体。
我们来试试看……
请记住摩根老师的话：
“先轻描，确认准确后再加重，或改用记号笔。”
你可在我的 TPT 店铺中获取这张教学海报：
https://www.teacherspayteachers.com/Store/The-Lost-Sock-Art-Teacher
我特别喜欢“练习仙人掌”这一活动，因为它是一种简单又优美的方式，帮助孩子学会运用自然的轮廓线，将二维图形转化为三维形体！当孩子们通过练习掌握了相关技能后，还能围绕这些神秘植物开展大量延伸创作。
刺梨仙人掌（如下图）
巨人柱仙人掌（如下图）
金琥仙人掌（如下图）
仙人掌绘制练习
Original: https://tabithaannthelostsock.blogspot.com/2014/09/how-to-practice-cactus.html
Date: 2014-09-16
Tags: art, cactus, contour lines, Desert, elementary, how to draw, lesson plans, plants, western
Think about a globe...
There are lines that flow from the top North Pole to the
bottom South Pole.
When your perspective is at the equator, you see a straight vertical line down the center of the globe.
Each line to the right of the straight line curves right and each line on the left curves left.
They curve more and more until they reach the end of the earth.
See the small cactus below?
It does the same thing.
Each line to the right of the straight line curves right and each line on the left curves left.
They curve more and more until they reach the end of the cactus.
These are called
CONTOUR LINES.
You can draw these on shapes to make them forms.
Let's try...
Remember what Mrs. Morgan says,
"Draw light til' you know it's right,
then go darker or use marker."
Get this poster for your classroom here on my TPT store...
https://www.teacherspayteachers.com/Store/The-Lost-Sock-Art-Teacher
I love "Practice Cactus" because it is an easy and beautiful way to teach kids how to use natural contour line to transform a 2D shape into a 3D form! There's so much you can do with these mysterious plants after the kids are able to get skills built by practice.
Prickly Pear Cactus (below)
Carnegiea Gigantea (below)
Echinocactus (below)
