Digital architecture uses computer modeling, programming, simulation and imaging to create both virtual forms and physical structures. The terminology has also been used to refer to other aspects of architecture that feature digital technologies. The emergent field is not clearly delineated to this point, and the terminology is also used to apply to digital skins that can be streamed images and have their appearance altered. A headquarters building design for Boston television and radio station WGBH by Polshek Partnership has been discussed as an example of digital architecture and includes a digital skin.