nothing to do with number of legs up or down. They are boxes...

nothing to do with number of legs up or down. They are boxes constructed using specific rules to set the bottom and top of the box. The top acts as a breakout if accompanied with volume (buy in or add to position) and the bottom acts as a stop loss (sell). As the price moves the rules on box calculations need to get constantly monitored to determine if a new box should be calculated, still in same box etc...

Best to buy the book and read it - but volumes were a lot lower back in those days so some tweaking might be worth considering based on that.