Well, I don't think the intention is to stop the movement, it's probably a good enough spot where some people would still want to buy and others to sell. Assuming the pressure is uniform, the owner of those walls should continuously make money. If that is the case, eventually the volatility should dampen and the price would need to be pushed around a bit to attract attention.

Well, there's no price over time data, but the bar form of the depth chart ls interesting for visualizing where the demand is built up along the price axis. Looks like there's a lot of demand for bitcoins at $7.50 and even more people who want to sell bitcoins at $9.