In the latest Desktop Diaries video, we take a trip to the office of theoretical physicist and futurist Michio Kaku. Kaku’s office is full of decades’ worth of books, awards, and bygone technology. He says, “it’s pointless to have a nice clean desk, because it means you’re not doing anything.”

And for good measure, watch the other videos in the series — at the desks of Brian Greene and Oliver Sacks.