▁the ▁land , ▁but ▁is ▁also ▁associated ▁with ▁the ▁calm ▁fresh water ▁systems ▁where ▁the ▁spirits ▁res ide , ▁among ▁water ▁l il ies ▁and ▁pal m ▁trees . ▁The ▁y i ḏ aki ▁sometimes ▁also ▁contain ▁these ▁qual ities : ▁some ▁have ▁powerful ▁ac oust ics , ▁called ▁bay war ay i ḏ aki , ▁( the ▁power ▁of ▁light ning ▁and ▁th under ); ▁others ▁are ▁D ju ŋ g arr iny , ▁long ▁and ▁deep - s ounding , ▁with ▁a ▁gentle , ▁so othing ▁sound , ▁but ▁also ▁powerful : ▁the ▁v ibr ations ▁are ▁said ▁to ▁stir ▁Wit it j . ▁ ▁Art ▁G uru wi wi ' s ▁art ▁includes ▁print making ▁and ▁earth ▁p ig ments ▁on ▁string y b ark ▁( also ▁known ▁as ▁b ark ▁paint ings ). ▁He ▁is ▁also ▁a ▁painter ▁of ▁sacred ▁min y ' t ji ▁and ▁a ▁mak er ▁of ▁sacred ▁ra ŋ ga , ▁objects ▁rarely ▁seen ▁by ▁out s iders . ▁ ▁G ur ru wi wi ▁is ▁a ▁respect ed ▁artist , ▁with ▁his ▁b ark ▁paint ings ▁on ▁eu cal y pt us ▁b ark ▁being ▁acquired ▁by ▁numerous ▁important ▁institutions , ▁including ▁the ▁National ▁Gallery ▁of ▁Victoria , ▁the ▁Art ▁Gallery ▁of ▁South ▁Australia , ▁the ▁South ▁Australian ▁Museum , ▁the ▁Kl uge - R u he ▁Ab original ▁Art ▁Collection ▁of ▁the ▁University ▁of ▁Virginia ▁and ▁many ▁private ▁collections . ▁His ▁work ▁has ▁been ▁included ▁in ▁numerous ▁exhib itions ▁since ▁ 1 9