It seems to me that no other architectural features carry such a freight of emotional associations, recollections, recognitions as windows, doors, gateways, portals of all kinds. They mark literal or figurative boundaries. They can fill us with dread, bemuse us with nostalgia, or lift us up with hope and gladness. They spark our creativity and ingenuity, and allow us to express our individuality when they are ours to design and adorn. They control to some extent the light that fills a space, and thus how we experience the space. They speak to us in so many ways.