I believe that computers and keyboard-mouse interactions with a GUI are great inventions, but not for all applications, users and contexts of use.
That is why I got so interested in tangible interaction. This new field shows potential for making the increasingly digital world physical again,
without loosing the obvious benefits of the digital.
In my work I try to understand how to design tangible interaction in such a way that users can benefit most,
physically, mentally as well as socially.
The design interests me at all levels, e.g. the form-giving of the object, the interactions people have with
physical artifacts (grasping, picking, building), but also: how to design for remembering, for new innovative interactions with light and lighting, for fun and games, for social interaction,
for meeting someone, for (collaborative) learning, for distributed cognition or embodied interaction.
The approach I use is Research through Design and Interaction Design, with a clear focus on the user. If you want to know more about this process,
I suggest you take a look at the following paper:
Hoven, E. van den, Frens, J., Aliakseyeu, D., Martens, J-B., Overbeeke, K. and Peters, P. (2007). Design Research & Tangible Interaction, Proceedings
of Tangible and Embedded Interaction 07, Baton Rouge, Louisiana, USA, pp. 109-116. 
Download 1.7 MB [pdf]
The other papers and projects that you can find on this website will show you more details of my design research work.