Modified, a tiny performance space in a converted antique shop in the middle of a street with nothing else on it, is one of those great ideas that shouldn't have worked. But in two and a half years Modified has garnered nothing but critical hosannas, largely on the strength of its aggressively no-frills mandate. Patrons sit on benches, or at one of a half-dozen small tables, or cross-legged on the floor. Performers set up no more than a foot away from the nearest audience member. Performer and patron can't help but vibe off each other's energy, lending shows at Modified a rare intimacy. And while local bands still make up the bulk of Modified's roster, several nationally known acts (such as Austin's Knife in the Water) have enjoyed it so much they've come back for repeat performances.