Most of “The Art of Time” is crammed into a hallway, the rest into a forecorner of a typically loud and busy children’s museum, but go see it anyway — and not just because it’s for a good cause. Some 70-odd artists — artists for a day or for a lifetime — have concocted objects that tell time, pretend to, or simply concern time’s telling, and the variety of approaches alone is a trip. Craft is in notably rich supply (given the number of participants who don’t usually make things), as are wit, cleverness and even pathos. The, er, recognized artists in the bunch have generally taken the assignment as a chance to break out of form, at least a little, so that Robert Graham can play not just with the figure but with the hourglass, Brad Howe can “explode” a spider’s web of shapes around a clock, Ashley Collins can align a watch with the silhouette of a dog (you do the rebus), Charles Arnoldi can fabricate a clock face from myriad colored wedges, and so forth. A contingent of activist social heroes also clock in with concoctions that may be less visually engaging but pull you in with gripping back stories. At the Zimmer Children’s Museum, 6505 Wilshire Blvd., Los Angeles. Tues.-Thurs., 1-5 p.m.; thru June 9. (323) 761-8992.