Clark Humphrey has written for just about every paper in town. Lately hes applied his inexhaustible urban curiosity to the Images of America series of history booksslim little paperbacks basically consisting of vintage photos and captions. Its a perfect format for Humphrey in Seattles Belltown (Arcadia Publishing, $19.99), from which hell read and presumably show photos tonight. The book allows him to be erudite without being overbearing, providing quick hits of historical trivia on architectural oddities, forgotten buildings, and lipstick traces remaining in the former Regrade. Though a condo-hating anti-growthnik with strongly nostalgic feelings towards his home turf (where he also publishes The Belltown Messenger), hes not a crank. These photos, culled mostly from the Seattle Municipal Archives and MoHaI, document the inevitability of change. Of one long-forgotten tiki bar, he writes, Some of the décor now hangs at the Crocodile Café. Not anymore, sadly, but thats another book. Form/Space Atelier, 2407 First Ave., 349-2509. Free. 6 p.m.