German designer Christian Strauss has created the LENA light.
From the designer:
LENA is a leaning light made of aluminium round pipe. The lamp has a finishing of liquid gum, resulting thereby a very pleasant haptics and matt black optics. A tilt angle contactor provides for the on/off switch inside of the lamp and it underlines the gesture of the leaning perfectly; the quicksilver inside of the tilt angle contactor inclines when the lamp is leaned on the wall or the furniture and merges thereby two contact parts providing smooth current flow. Therefore supplies LENA with direct or diffuse light only in leaned position.