From the Manufacturer
The simplicity of the Qube System turns layout from frustration to enjoyment. Just position the base, point the qube(s) wherever you need them, and you're ready to go. The qubes snap magnetically to the base and to each other at perfect square angles so they can be rotated and positioned in practically infinite arrangements. For example, a line qube can be used to project a precise horizontal line on the wall to install cabinets or shelves, or it can be rotated 90 degress to project a vertical line for perfect tile or wallpaper alignment. Features a Manual-Leveling Base - three point base with two adjustment screws and two bubble vials to allow independent adjustment of each axis.