Reference: THRESHING FLOORS
Watsons
THRESHING FLOORS, among the ancient Jews, were only, as they are to this day in the east, round level plats of ground in the open air, where the corn was trodden out by oxen, the libycae areae of Horace. Thus, Gideon's floor, Jg 6:37, appears to have been in the open air; as was likewise that of Araunah the Jebusite; else it would not have been a proper place for erecting an altar and offering sacrifice. In Ho 13:3, we read of the chaff which is driven by the whirlwind from the floor. This circumstance of the threshing floor's being exposed to the agitation of the wind seems to be the principal reason of its Hebrew name; which may be farther illustrated by the direction which Hesiod gives his husbandman to thresh his corn in a place well exposed to the wind. From the above account it appears that a threshing floor (rendered in our textual translation "a void place") might well be near the entrance of the gate of Samaria, and that it might afford no improper place in which the kings of Israel and Judah could hear the prophets, 1Ki 22:10; 2Ch 18:9; Ps 1:4.