Brownian motion is the most fundamental stochastic process in financial engineering. Except the precise Mathematical description, it may be hard for us to visualize it. Here, I provide three website for those who want to visualize Brownian motion to refer :)
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=24
http://xanadu.math.utah.edu/java/brownianmotion/1/
http://www.stat.umn.edu/~charlie/Stoch/brown.html
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