Hamburgers having sex is just one of the features of Michelle Ellswortha's multimedia project "The Objectification of Things." She also uses Astro-turf, images of death and torture, carbon biochemistry,and synchronized back-up dancers. Ellsworth and company perform "The Objectification of Things" at 8 p.m. March 20 and 21 at DiverseWorks, 1117 East Freeway. For information, call 713-335-3445 or visit www.diverseworks.org. $15.