Curators are kind of like the tour guides through a collection of artwork, attempting to bridge that ever-expanding rift between artist and slack-jawed visitor. Sometimes their job is like arranging visual grammar; at other times, they act as human Rosetta Stones -- not explicating the art so much as placing it in cultural context. So for that reason, there's something novel about "Young Curators, New Ideas," a show at Brooklyn's Bond Street Gallery (closing September 6), which tracks trends in current art photography through the eyes of six curators (some seasoned veterans, some green newbies.