Allied Architects, an association founded in 1921 to provide governmental organizations with professional architects at a reasonable cost, creates the Bowl's first arched proscenium stage. The wooden frame consists of a low elliptical arch with a circular arch inside. The shell creates more acoustical problems than it solves, which leads to its renovation at the end of the season. The construction of a permanent seating area and stage facilities is completed.
Pasadena architect and Rose Bowl designer Myron Hunt creates an elliptical form for the Hollywood Bowl's seating amphitheater. His layout features monumental stairways that reinforce the seating area's dramatic balloon shape, which has been described as being "poised to fill with music and ascend."
The Hollywood Bowl Association gives Lloyd Wright instructions to design a semi-circular shell and tackle the dual issues of acoustics and aesthetics. The shell consists of nine concentric segmented arches, which can be "tuned" panel by panel. The shell is at the forefront of the Streamline Moderne movement and is an acoustic success.
Designed by the engineering firm of Elliot, Bowen, and Waltz and built by Allied Architects, the new 55-ton shell becomes an architectural icon. The massive shell is mounted on rails which allow it to be moved by tractors. Although the shell is ultimately replaced due to issues with acoustics and deterioration, the gracefully curved form becomes the signature shape of the Bowl shell.