Most Porcupine Tree fans already know this, but lead guitarist Steven Wilson is also a keen experimental artist, although he keeps that facet of his activities well separated from his progressive rock career. Pacific Codex is Wilson's (and his side project Bass Communion's) most avant-garde album to date, one geared at connoisseurs of drone music and electro-acoustic music much more than Porcupine Tree's audience. This album features Wilson and Theo Travis using metal sculptures by Steve Hubback to produce sounds. This source material was later extensively processed and assembled by Wilson into two 20-minute pieces. A percussion album this is not, nor is it industrial-sounding, as some readers might be expecting from the above details…