Houdini™ Just like magic, the Houdini™ simplifies your choice of keyboard arms, because it works just about anywhere and does just about anything. Short return? Corner work surface? No problem! The Houdini™ extends far enough to work in a corner, but still retracts fully on a short, 17¾” (450 mm) track. You can change your keyboard position quickly and easily with lift-and-release height adjustment and soft touch tilt-a-wheel for tilt adjustment. Position indicators for both height and tilt allows you to find your preferred keyboard position, time after time.