<prompt> Translate the following text to EnglishNyumba zake za mbao za karne ya 15, 16 na 17 ni mifano ya ajabu ya usanifu wa Norman wenye nguvu, na hufikia ukosefu wa utaratibu mzuri katika njia ya plaster iliyowekwa katika maumbo ya mviringo kati ya nguzo za mwaloni na beams za kola zinazounga mkono balcony.  <response>: Its timber-framed houses of the 15th, 16th, and 17th centuries are marvelous examples of sturdy Norman architecture, achieving a pleasing irregularity in the way the plaster is set in oblique forms between the solid oak posts and collar beams supporting the balconies. 