reality check, page-101

The reality is that the wall was never really there. You should be very wary when interpreting the buy and sell columns as many of the bids are "fake", especially on the buy side. As an example, if you put a bid in at say 18c and take an immediate look at the stack at the 18c mark you will often find that your bid is in the middle of the stack, not at the bottom where you would expect it to be. Also, all the bids at 10c and lower are obviously out of the equation. You would probably find that at the moment the buy/sell stacks are pretty equal.