The second, the true circular era, spanned from 1889 to 1936. The overlap meant that round barns of both types, polygonal and circular, were built during the latter part of the nineteenth century.
This era, marked by a genuine circular identity, occurred between 1889 and 1936. Consequently, both polygonal and circular round barns were built towards the end of the 19th century, reflecting an overlap in architectural styles.