differentieel

ferrie = differentieel (retired artist) is a pseudonym of Ferrie (1947, Amsterdam)
differentieel means a 'switching mechanism' in Dutch
but also means 'variation'
the greater the variation, the more the brain is challenged, are his thoughts.

this variation can be found in his background
first as a painter and designer,
but since 2007 as a sound-designer, arranger and composer
meanwhile he also has an impressive list of compositions to his credits.