Though I cannot remember, these Mushroom Lamps do look readily familiar. Regardless though, this is the first time I have seen of a rocking lamp, something which should be an attention-capturing piece.
The Mushroom Lamp was a result of a collaboration between Nick Rennie and Ligne Roser, this is actually a redeveloped version of something which came out in 2002.
The lamp apparently rocks for some time before coming to a halt and in a standing position. In a way, it needs to balance itself, the time of which may vary and depend on how it was placed or where it was placed.