This piece is Stretto, which refers to a technique in a fugue where the musical theme overlaps itself particularly intensely.  Here, 204 CDs overlap each other rather intensely. The visual effect is quite unusual, in part because of the shifting diffraction effects on the surfaces, but also because the reflections make it appear that the CD-ROMs are translucent. Adjacent CDs meet at right angles, so the parts of one CD blocked by its neighbor are exactly replaced by a reflection of its closer half. Maybe it is easier to see on a close-up image:

Stretto won an Award of Excellence at a recent Long Island competition, after which I decided to make a number of other CD sculptures.