 He was an active advocate for science and technology and was often asked as a keynote speaker for events related to these areas, and for theme days on schools and universities.His appearances on radio and television became relatively rare.He founded projects such as the now defunct "Huis van de Toekomst" (House of the Future), "Kantoor van de Toekomst" (Office of the Future) and the "Ziekenhuis van de Toekomst" (Hospital of the Future).