When redesigning the factory, Musk put the cubicles for the engineers right on the edge of the assembly lines, so they would see the flashing lights and hear the complaints whenever one of their design elements caused a slowdown. Musk often corralled the engineers to walk up and down the lines with him. His own open desk was in the middle of it all, with no walls around him, and it had a pillow underneath so he could spend the night when he wanted.

Elon Musk by Walter Isaacson