This is an animation of the order books in a simple supply and demand experiment. Trading prices and time are graphed in green on the left. To the right, the order books are graphed, with the best price offers on the left and the worst offers on the right. For each offer a line id drawn back to the time the offer was placed. The black line is the median of the nth best buy and sell offers. By looking at the books, you might want to guess whether the price is going to go up or down.

y axis, trading price and order price
x axis, time (hours)