Wood related in that they're made from wood (!?). The lamps are actually from birch that got damaged in the ice storm last year. The big one has the cable running down the back - I drilled a hole through the middle of the small lamp with a very long drill bit and two clamps, otherwise known as my feet. Unsurprisingly the spade bit would regularly get bogged down, and instead the 14" long, 4" diameter log would spin at 3,000 rpm instead. Needless to say, my ankles, which were in the rotation zone of the momentum-rich log, suffered greatly. Equally, I managed to let lots of the magic smoke out of the drill's motor....