The Challenge: lost my head
The Challenge: round and round
The Challenge: behind rose garden, endless desert
The Challenge: doubtful & disputed
The Challenge: Is Man a Machine or a Moral Agent?
The Challenge: true irradiation
The Challenge: writing the poetry
The Challenge: Beethoven was never lying
The Challenge: pandora
The Challenge: If you look back dear Ivo, is there anything to smile about?
The Challenge: don't stop me now
The Challenge: shadows on my path
The Challenge: are you ready
The Challenge: Morning in the Netherlands
The Challenge: My loving Grandparents and Via Dolorosa
The Challenge: ambiguity
The Challenge: endearments
The Challenge: Humans are optimist by nature cause they never made friends with the cockroaches.
The Challenge: hoodwink
The Challenge: we can endure anything
The Challenge: The Way I Feel
The Challenge: love writes poetry