Lateralus, easily. I liked 10,000 Days but you can tell the band's running out of real estate. Undertow, Aenima and Lateralus sounded nothing alike (and rightfully so, for spreading your discs apart so far), but this one lacks innovation. I still enjoyed it, though. I know the ToolSheep told me to meditate and light candles to "better enjoy it" and to "further grasp it." Fucking morons.