Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Input: Passage: Another major influence in his work was the rise of interest in vernacular architecture. By the time Douglas moved to Chester, the black-and-white revival using half-timbering was well under way, and Douglas came to incorporate this style in his buildings in Chester and elsewhere. The black-and-white revival did not start in Chester, but it did become Chester's speciality. The first Chester architect involved in the revival had been Thomas Mainwaring Penson, whose first work in this genre was the restoration of a shop in Eastgate Street in the early 1850s. Other early Chester architects involved in the revival were T. A. Richardson and James Harrison and it came to be developed mainly by T. M. Lockwood and by Douglas. Part of Douglas's earliest work for the Grosvenor family, the entrance lodge to Grosvenor Park, used half-timbering in its upper storey; this is the first known use by Douglas of black-and-white. Other vernacular motifs were taken from earlier styles of English architecture, in particular, the Tudor style. These include tile-hanging, pargetting and massive brick ribbed chimney stacks. In this style, Douglas was influenced by the architects Nesfield and Shaw. Douglas also used vernacular elements from the continent, especially the late medieval brickwork of Germany and the Low Countries.A characteristic of Douglas's work is his attention to both external and internal detailing. Such detailing was not derived from any particular style and Douglas chose elements from whichever style suited his purpose for each specific project. His detailing applied particularly to his joinery, perhaps inspired by his experience in his father's workshop, and was applied both to wooden fittings and to the furniture he designed. A further Continental influence was his use of a Dutch gable. The most important and consistently used element in Douglas's vernacular buildings was his use of half-timbering, which was usually used for parts of the building. However, in the cases of Rowden Abbey and St Michael and All Angels Church, Altcar, the entire buildings were timber-framed.
Output:
Half-timbering is a component of what type of architecture?