A dedication ceremony inaugurating the late Sol LeWitt's "Bars of Color within Squares" will take place from 4 p.m. to 6 p.m. Friday, Oct. 19, in Building 4. The new work by LeWitt, who passed away in April, is a major feature of the PDSI building project. The design consists of 15 large squares of vibrantly colored geometric patterns, set off by bands of white and gray, that shift ambiguously between flatness and the illusion of depth. Each block is approximately 18 feet square, and the work's bold colors are realized in glass and epoxy terrazzo that was poured in place. For more information, please contact Mark Linga at firstname.lastname@example.org, 617-452-3586.