The point of this is to show accumulation and distribution. This works for all trading instruments/charts. We won't know if that last (yellow) box is accumulation or distribution until price moves out of the box, either up or down. Drawing these boxes just helps me visualize when it's likely that there's a new trend incoming, rather than sideways action. This will seem obvious to anyone who has been trading a while and has studied accumulation and distribution (Wyckoff). New people might find this example useful, though.