When the hair is tied to the base it is 'vented' or 'knotted' in a certain direction per the customers instructions. So if you order, say, left break then the hair is directed in that style. By far the most common request for style is 'free style.' With 'free style' venting the hair is not directed in any particular style. The hair is tied in a random fashion and this allows the customer to comb the hair in any style and experiment with styles. Free style venting can be used for comb back, comb forward, side part, spikey front.....you name it.
Regards,
John