Before MacOSX, Apple Computers shipped an OS that had a unified look-and-feel. From System 8.0 to System 9.2.2, the look was called Platinum. Since the advent of MacOSX, a few different interfaces have become common on the Macintosh. Among these are Aqua, Brushed Metal (which began as a skin for Quicktime during the MacOS Classic era), and now Unified. Iridium is similar to the original Platinum, yet it offers a sleek white metal look which you should enjoy.