M-M has expanded the HS1 shelving system to include several new functions. Single - and double - height credenzas provide platforms for concealment and display; objects can be staged within the credenza's open storage or tucked away behind the cabinet's' sliding steel doors. The addition of the HS1 writing desk provides a surface to create and contemplate. The desk utilizes a perforated back panel , which provides structure and acts as a mounting surface for organizational accessories that come with the desk set. HS1 components can be combined and customized to accommodate any space or application-the system is more flexible and functional than ever.