Sometime Bertjan, initiates a project himself because he likes it so much that it just has to be made. Sometimes he is commissioned to do a project because other people like his work and think he is the one to do the job. His main fascination is material and production processes. Everything is made out of material and materializing is an inevitable but often forgotten part of the design process.
In design he likes to experiment with computer aesthetics and industrial production methods, but without using a computer (at least not as a design tool) and sometimes also without the industrial production method. Almost all designs come from experiments in materials, old and new.