Fifteen thousand voices packed into an oval of color and sound — this spectacular linen postcard captures the Main Arena of Kansas City's Municipal Auditorium at full roar, its vast crowd rendered in Curteich's signature Art-Colortone palette of gold, coral, and sky blue that makes the scene pulse with midcentury civic pride. Opened in 1935, the auditorium was an engineering marvel of its day: a domed ceiling suspended 96 feet above a 301-by-291-foot floor, the whole structure held aloft without a single post or pillar to block a spectator's view. The reverse text reads like a press release from the building's proud boosters, enumerating its gigantic oval floor of 130 by 220 feet — figures that still impress today. Published by Max Bernstein of Kansas City and printed by the Genuine Curteich-Chicago "C.T. Art-Colortone" process, this unused card is a showpiece of the linen era's most ambitious printing technique, depicting an event — possibly a convention or graduation ceremony — that filled every seat.