This pretty inconspicuous looking cube light transforms into a few different shapes. Robhoff has created a collection of lights, Modular Lights, funnily enough. Using mainly aluminium and steel these quirky pieces adjust and simply turn and tilt the different faces of the light to direct the right amount of light you need. The shapes of the light coming through the side can be beautiful, it just depends on how you twist the sides, I love the way it creates patterns on the walls.
They are very nice! Bet they cost a fortune though!