Hans van Koolwijk makes sound art. He experiences sound as an almost

tangible material and works with it the way a sculptor works with stone or clay. As an artist he has always felt the need to visualise sound as an image: 

sound becomes something you can see

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Hans van Koolwijk works with composers and with ensembles. The works he produced have been used by visual artists, designers & architects, and 

moviemakers. By collaborating with composers, musicians, choir, dancers, and other sound artists, his work has become more versatile.