There are thus two major types of areas: public and private. In addition, there are many areas that are not as populous as a public area in the desert, but the Sages prohibited carrying there, because one might then come carry in a real public area. These are called "Karmelit." The root of this word is "Karmel," which means a field, cultivated or not.
To make yourself work hard, you can think of the following question. If you have a ditch nine tefachim (handbreadth) deep, it is not yet a real private area. One is allowed to carry things there. However, if he takes earth from that pit, he makes it into a private place. Has he violated Shabbat? When he started digging, it was not a private area, but by the time he finished, it was! The major question is when the area acquires the new status.
Art: Peasant Woman Digging by Van Gogh





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