61 Pottery
Ancient people made clay pottery because they needed it for their survival. They used the pots they made for cooking, storing food, and carrying things from place to place. Pottery was so important to early cultures that scientists now study it to learn more about ancient civilizations. The more advanced the pottery in terms of decoration, materials, glazes and manufacture, the more advanced the culture itself.
The artisan who makes pottery in North America today utilizes his or her skill and imagination to create items that are beautiful as well as functional, transforming something ordinary into something special and unique.
The potter uses one of the Earth's most basic materials, clay. Clay can be found almost anywhere. Good pottery clay must be free from all small stones and other hard materials that would make the potting process difficult. Most North American artisan potters now purchase commercially processed clay, but some find the clay they need right in the earth close to where they work.
The most important tools potters use are their own hands; however, they also use wire loop tools, wooden modeling tools, plain wire, and sponges. Plain wire is used to cut away the finished pot from its base on the potter's wheel.
After a finished pot is dried of all its moisture in the open air, it is placed in a kiln and fired. The first firing hardens the pottery, and it is then ready to be glazed and fired again.
For areas where they do not want any glaze, such as the bottom of the pot, artisans paint on melted wax that will later burn off in the kiln. They then pour on the liquid glaze and let it run over the clay surface, making any kind of decorative pattern that they want.
陶器
古代人制作陶器是因为他们的生存需要它。 他们用这些自制的盆盆罐罐来做饭、 装食物、储运东西。 陶器在早期文化中占据了如此重要的地位，以致于科学家们现在通过 研究陶器来获取对古代文明的更多的了解。 因为陶器的装饰、材料、釉彩、制作等工艺越 发达就说明这种文明越发达。 今天，北美的陶艺匠人运用他们的技艺和想象力创造出了既 美观又实用的陶艺制品，把日常用品变为独特的艺术品。 制陶匠人使用大地上最基本的原材料--粘土。 粘土几乎随处可见，但好的制陶所用的粘土必须不含小沙粒或任何硬物，否 则会给制陶过程带来不便。 现在大多数北美制陶艺人买现成的专用陶土，也有些陶匠乐于 就地取材，在作坊附近自己挖粘土。 制陶器最重要的工具是工匠们自己的双手，但有时他 们也用些别的工具，如绳圈、木模、素线、海绵等。 素线的作用是当一件陶器完成后用它 把陶器从转盘上的基座上切下来。 陶器成形后，首先要在空气中自然风干，再放到窑中焙 烧。 第一遍焙烧使得陶器变得坚硬，下一步就是给它上釉彩，然后再焙烧。 陶器上有些地 方不需上釉彩，像罐子底部，匠人们就在这些部位涂上蜡，一加热就会化掉。 然后匠人们 把釉彩液体浇上陶器表面，绘制他们想要的任何图案。
62 Mimicry in Plants
Plant adaptations can be remarkably complex. Certain species of orchids, for instance, imitate female bees, other plants look and smell like dead animals, and still others have the appearance of stones. These strange adaptations to life represent just a few of the sophisticated means by which plants enhance their chances of survival. Mimicry in plants or animals is a three part system. There is a model: the animal, plant or substrate being initiated. There is a mimic: the organism that imitates the model. And there is a signal receiver or dupe: the animal that cannot effectively distinguish between the model and the mimic. Mimetic traits may include morphological structures, color patterns, behaviors or other attributes of the mimic that promote its resemblance to a model. That model may be either an unrelated species or an inanimate object, such as the background against which an organism s [1] [2] 下一页 |
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