Acoustic panels
9 of 10 from Photos: Inside IBM's deep green data center
Although these look like plain posters, they are made of a material to keep the noise level down in data centers. By dampening the amount of vibration off them, the panels make it quieter for people who work in data centers, which can get loud.
September 16, 2009 3:24 PM PDT
Photo by: Martin LaMonica