The aircraft was being taxied on an apron between several hangars. Painted guide lines were provided to allow obstacle clearance, however the pilot had difficulty seeing the lines over the nose cowling. As the aircraft passed a parked aircraft on the right, the left wing struck a power pole. The pilot had evidently not followed the marked guide lines. The pole struck had a weathered appearance, and was not easily distinguished against the grey colour of the hangar wall. The pilot also commented that he was distracted by the presence of the parked aircraft.