Final answer:
The most significant architectural detail of the Thorncrown Chapel is its use of large panes of glass that create a seamless integration with the natural environment.
Step-by-step explanation:
One of the most significant architectural details in the small but highly celebrated Thorncrown Chapel is its use of large panes of glass and the way the structure incorporates its natural surroundings.
The chapel was designed by architect E. Fay Jones and completed in 1980 in Eureka Springs, Arkansas. Its design is often lauded for its delicate wooden structure that appears to merge seamlessly with the surrounding forest.
The chapel's design is a crowning achievement of modern architecture, drawing influences from Gothic architecture and particularly from the Prairie School of design, which emphasizes harmony with the natural environment.
The large amount of glass used in the structure floods the interior with natural light and provides an open, airy feeling. This level of integration with nature is typical for Jones, who was an apprentice of Frank Lloyd Wright.