Which window is a circular wheel-like opening often divided by mullions into segments?

Which window is a circular wheel-like opening often divided by mullions into segments?

• A. Clearstory
• B. Oriel
• C. Diocletian window
• D. Palladian

Answer: (C)

The wheel-like circular opening subdivided by mullions is a Diocletian window. It features a round or semicircular opening on a facade whose mullions split the opening into multiple panels, giving a wheel-spoked look. This term comes from Roman architectural motifs and is often used in classical or neoclassical facades to create a strong, decorative focal point. In contrast, a clearstory is simply a high, light-giving window; an oriel is a projecting window; and Palladian windows are a three-part arrangement with a central arched opening and side rectangles, not a circular wheel.

The wheel-like circular opening subdivided by mullions is a Diocletian window. It features a round or semicircular opening on a facade whose mullions split the opening into multiple panels, giving a wheel-spoked look. This term comes from Roman architectural motifs and is often used in classical or neoclassical facades to create a strong, decorative focal point. In contrast, a clearstory is simply a high, light-giving window; an oriel is a projecting window; and Palladian windows are a three-part arrangement with a central arched opening and side rectangles, not a circular wheel.