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In 1873 Francis Galton had constructed a simple mechanical device where a ball is dropped vertically through a harrow of pins that deflect the ball sideways as it falls. Galton called the device a quincunx, although today it is usually referred to as a Galton board. Statisticians often employ (conceptually, if not physically) the quincunx to illustrate random walks and the central limit theorem. In particular how a Binomial or Gaussian distribution results from the accumulation of independentdoi:10.1142/s0218127407020129 fatcat:sj6rf6vhjraxhpsy4lr7m25upa