I don't know a lot about Zen meditation but it kinda seems to me Buk was doing it without even realizing it. Those many nights after slaving away at some shit job, he would just lay there in bed in the dark, drinking, smoking, and just stare at the ceiling or dresser/drawer for hours. Also, when he was drinking in some bar, he describes just sitting there for hours and studying the grains of the wood of the bar and being acutely aware of the sounds around him. Even later on in his life, going up to his room at night and opening up a bottle of wine, smoking a cigar and listening to classical music, he would get into a "zen" state where he waited for the poems to come gushing out of him rather than him forcing them out.Probably why he took to practicing meditation those few months before he died. Then again, everything I just said could be complete bullshit.