From the end of the 1970s, Ann Veronica Janssens has worked on visitor experience. Her career has produced intangible works. Her in situ installations, playing with reflections, luminosity, transparency, are produced using ephemeral elements such as light, artificial mist, sound and simple materials which are only the means or the media whereby visitors are guided to experience the fleeting lived moment, the  subjectivity of space perception, of temporality, and their continuous evolution. This transformation of the material by the immaterial leads to a loss of bearings and a sense of instability, which swings from the physical to the psychological. The visitors are actors in their own unique experiment, through their movements, their perception of the devices from the artist's imagination, and through these devices, of the architecture and space of the places which she builds.

She has represented Belgium at the Venice Biennale (with Michel François) and that of São Paulo, and has taken part in biennales in Istanbul, Sydney, Sharjah and Beppu. Her personal exhibitions include Grand Bal at the Pirelli HangarBicocca in Milan in 2023, at the  Panthéon in 2022, at the South London Gallery in 2021, at the Louisiana Museum of Modern Art in 2020, at the Musée de l’Orangerie in 2019, at De Pont, Tilburg, in 2018, at the Institut d’Art Contemporain, Villeurbanne in 2017, at the Nasher Sculpture Center, Dallas, in 2016, at S.M.A.K., in Gand, in 2010, at the WIELS Centre d’Art Contemporain, in 2009, at the Museum Morsbroich in 2007, at the Musée d’Orsay in 2003 and at the Neue Nationalgalerie in 2001. In 2009, with Nathalie Ergino she initiatived the “Laboratoire Espace Cerveau” at the IAC in Villeurbanne.