How Can I Stop My Housemate from Accumulating Stuff?

Dear Momofuku,
My housemate is a pack rat, a hoarder. He picks up furniture that other people leave on the sidewalk, thinking one day he'll sell it or fix it up and use it, but he never does. He has thousands of records, hundreds of old magazines. He has so much stuff in his room that to get to the bed he has to sidle through corridors he has carved out between giant piles of stuff. It's a fire hazard, and now his stuff is creeping out into the common areas. I ask him to move it and he says he will, but he doesn't. His stuff keeps growing and growing. What should I do?
-- Minimalist

Dear Minimalist,
In his book, "How to Escape from Difficulty," Momofuku Ando wrote, "Whether it be food, sex, or power...desire always breeds more desire. Eventually, it can become difficult to control." The same thing is apparently true for your housemate's desire for stuff. Ando escaped this cycle (and invented instant ramen) only after realizing that his desires were generated, essentially, from hidden shame. So maybe have a discussion with your housemate about his shame?