Why was Fashions of 1934 notable for Busby Berkeley's work?

The 1934 film Fashions of 1934, directed by William Dieterle, is notable for the lively production numbers staged by Busby Berkeley.1

These sequences were particularly distinguished by their imaginative and opulent staging, most notably the climactic "Spin a Little Web of Dreams" number. This performance featured elaborate visual elements, including women dressed as human harps and a ship propelled by ostrich plumes. Such spectacles were characteristic of Berkeley's work during his tenure at Warner Brothers, where he revolutionized the musical genre by utilizing innovative camera techniques—such as overhead shots of precise geometric formations—to create fantasy worlds that defied traditional stage-bound conventions.23