Galton Board and the Normal Distribution

Also, see http://galtonboard.com/ .
You may not have heard of him, but Sir Francis Galton was a Victorian genius. The renowned polymath was born in Birmingham, England in 1822. The Galton Board is a 7.5” by 4.5” desktop probability machine. This delightful little device brings to life the statistical concept of normal distribution. As you rotate the Galton Board on its axis, you set into motion a flow of steel beads that bounce with equal probability to the left or right through several rows of pegs. As the beads accumulate in the bins, they approximate the bell curve, as shown by the yellow line on the front of the Galton board. This hands-on Galton Board allows you to visualize the order embedded in the chaos of randomness.