 Let's go over a market phenomena called flipping or flip of the book. This is a disruptive and prohibitive practice that is outlined in CME rule 575 on page 8. You can download this document from the CME to understand more about it. You'll see many variations of flipping today in the markets. Some of it may be considered legal while others are suspect. Nonetheless, bookmap is excellent at clearly visualizing flipping activity which allows you an advantage in your trading. Let's take a closer look at an example in the chart. First, notice the established trading range from the 930 cash open of the S&P E-mini. The first component to flipping is witnessing sell market orders hit the bid and sweep the book lower outside of a previously established trading range. Notice how price approaches the area of high liquidity on the bid. But as price approaches these limit buy orders, they are pulled away from the market. These traders no longer have any intent to trade at these price levels. Then we see a continuation of aggressive market sell orders hitting the bid and sweeping the book to even lower levels. Next we see the emergence of large sell limit orders flip from the bid over to the offer. This high liquidity on the offer acts as a barrier for price returning back into the previous trading range. The flip is now complete. The long traders that faded the outside edges looking for a return back to the mean are now trapped on the wrong side of the flip. Their longs are squeezed which fuels the fire to the downside. Once you start objectively recognizing flipping activity, you'll be able to take advantage of this phenomena and use it for your benefit in book map. For example, you could choose to set limit orders on the offer perhaps in front of the high liquidity that flipped to the aggressor's side. You are looking to get filled on a retracement back to where the market initially flipped. As you can see in this example, this was a pretty significant flip and market continued to the downside. As you recognize more instances of flipping, you also begin to notice the aggressiveness of the flip. Some flips occur at exactly the same price level, while others may occur at lower or higher levels from where they broke down. In our example, the flip was pretty aggressive because the orders flipped a few ticks above where they were previously pulled on the bid.