Final answer:
The question discusses 'Joisted Masonry' in building construction, highlighting the role of mullions as slender vertical forms that provide structural support and aesthetic appeal.
Step-by-step explanation:
The question pertains to the construction and architectural design of buildings, specifically the term 'Joisted Masonry' which is categorized under ISO Class 2, IBC Type III, and IBC Type IV. Joisted masonry construction involves buildings with exterior walls of masonry material and interior floors and roofs of combustible material, typically wood. The reference to 'bundled colonettes' and 'masonry feels more delicate' by Steven seems to address the aesthetic and structural contribution of mullions - slender, vertical forms that separate the windows. This architectural feature not only contributes to the visual appeal but also supports the structural integrity by allowing for more window space without compromising the strength afforded by traditional masonry walls.