also known as a compass window, this type of window is essentially a bay window but curved. They create extra space by surpassing the exterior building wall, which makes the view they provide wider. There can be four or more windows next to each other aligned in a shape of a D-ring. Often associated with the Victorian era, they are very popular nowadays as they match various architectural styles and are considered classy. What’s good about them is that they can be adjusted to your needs in terms of choosing or even mixing windows type (e.g. double-hung, casement or awning).