A kleroterion was a randomisation device used by the Athenian polis during the period of democracy to select citizens to the boule, to most state offices, to the nomothetai, and to court juries - wikipedia 
Kleroterion. This device was used for the jury selection system in Athens. Bronze identification tickets were inserted to indicate eligible jurors who were also divided into tribes. By a random process, a whole row would be accepted or rejected for jury service. There was a kleroteria in front of each court. Ancient Agora Museum in Athens.
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The kleroterion was a slab of stone incised with rows of slots and with an attached tube. Citizens' tokens (pinakia), were placed in the slots and the tube was filled with different-colored dice. The dice were released one by one, each die corresponding to a row of pinakia. The color of each die determined whether the owners of the pinakia in the corresponding row were selected for seats on the boule or juries.
Entrance to the Ure Museum of Greek Archaeology at Reading University showing two reconstructed Kleroterions.
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# See - Sortition - Kleroterion - One Hundred Percent - Theatre of the Oppressed - Art of Politics