Stella Boess is assistant professor at the TU Delft where she explores new methods for user research in and for design. Besides this, she pursues self-initiated and commissioned projects that investigate notions of product usage. One such project, a collaboration with Stefan Gross, is Love Hate Punch – a punching bag that lights up in the places it is hit. People who persist in working the bag are treated to a surprising bonus. In this manner it is a wonderful example of embodied interaction. The piece was exhibited at Re-ACT in 2008-2009.