Though we may take them for granted, doorways impinge on our lives in many ways. Their powers are even richer and more varied than those of the wall. They can change the ways we behave, and alter how we see our surroundings. They challenge us and protect our territories. They punctuate our experiences as we move from place to place. They set the geometry and measure of our relationship with space. They frame the in-between and stand as crystalisations of the moment. With its many dimensions, the doorway is an essential component of what might be called the common language of architecture...