Twenty-one years ago, the computer left the "glass house" for the desktop. Now a start-up appropriately named ClearCube wants to send it back.The Austin, Texas-based company is trying to popularize a new vision for office computing where users would still have monitors, mice and keyboards on their desks, but their superthin computers would be neatly stacked in centralized computer rooms--the descendents of yesteryear's so-called glass houses. The contemporary twist involves "blade"-style design, in which thin devices are stacked vertically in racks like books or record albums. Although the blade concept has taken the server and storage markets by storm, ClearCube's...