can be/ can be not
drawings by Harald Falkenhagen
A particular technique of employing one's fingers results in the note vacillating between sounding and not sounding.
One of the sources of inspiration for these compositions was writings on quantum mechanics by the philosophers Karl Popper and C. F. von Weizäcker.
Documents present the world 'discretely' (i.e. things are discerible as distinct units), the future is undecided/ open.