. Someone penning [animals] in his field makes a corral of two beis seah, [and then] removes three sides and leaves the middle; this results in his having penned an area of four beis seah. Rabban Shimon ben Gamliel says: An area of eight beis seah. [If] his total field was an area of four beis seah, he must leave over part of it, because of the appearance of impropriety. He [then] removes [it] from the enclosure and puts [it] into this field in the manner of those who store dung.