Most evocative of the O'Keefe influence are the panoramic yellow and brown hills punctuated by a bolus of blue sky like an O'Keeffian pelvic opening. (daytoncitypaper.com)
Case in point: Squatting increases the size of the pelvic opening by about 28 percent. (fitpregnancy.com)
A baby who is delivered through the vagina usually has an elongated head at birth due to moulding of the soft skull to accommodate itself through the pelvic opening. (newkidscenter.com)