Beiut if Gehry's masterwork evokes the eruption of an unbridled id, Koolhaas's creation is a more self-contained experience - one that vibrates with emotional and psychological tensions. Its surprises reveal themselves slowly, as if to draw you into a deeper unconscious experience. In originality alone, it ranks with Gehry's 2003 Walt Disney Concert Hall in Los Angeles and Hans Scharoun's 1960s-era Berlin Philharmonic as one of the most important concert halls built in the last 100 years.