During the 1990s. Janssens developed her installations that utilise lights and fog in parallel to the development and use of similar equipment in rave and club culture, to similar effect. Works such as Représentation d'un corps rond (Representation of a round body), 1996, or Untitled, 2002, use the potent combination of light and fog as a sculptural means, creating the visual sensation of three-dimensional apparitions, as well as spatial situations that are phenomenologically less determinable. In Janssens’ installations, the possibilities of new mental landscapes emerge using the colours and shapes that are formed in the mind.