▁silence . ▁Young ▁and ▁Z aze ela ▁worked , ▁sang ▁and ▁lived ▁in ▁it ▁and ▁studied ▁the ▁effects ▁on ▁themselves ▁and ▁visitors . ▁In ▁July ▁ 1 9 7 0 , ▁a ▁model ▁short - term ▁Dream ▁House ▁was ▁displayed ▁to ▁the ▁public ▁at ▁Galerie ▁He iner ▁Friedrich ▁in ▁Mun ich , ▁Germany . ▁Later , ▁model ▁Dream ▁H ouses ▁were ▁presented ▁in ▁various ▁locations ▁of ▁Europe ▁and ▁the ▁United ▁States . ▁ ▁The ▁work ▁presented ▁within ▁these ▁Dream ▁H ouses ▁consisted ▁of ▁a ▁" total ▁environmental ▁set ▁of ▁frequency ▁structures ▁in ▁the ▁media ▁of ▁sound ▁and ▁light ". ▁The ▁sound ▁was ▁produced ▁by ▁both ▁the ▁s ine ▁wave ▁gener ators ▁and ▁by ▁the ▁Theatre ▁of ▁E ternal ▁Music , ▁this ▁last ▁playing ▁at ▁pres cribed ▁intervals . ▁The ▁s ine ▁waves ▁produced ▁are ▁such ▁that ▁they ▁inter f ere ▁with ▁each ▁other , ▁creating ▁changes ▁of ▁volume ▁both ▁in ▁time ▁and ▁space ▁that ▁can ▁be ▁experienced ▁either ▁walking ▁within ▁the ▁room ▁or ▁stay ing ▁put . ▁If ▁one ▁cho oses ▁to ▁walk , ▁he ▁will ▁change ▁the ▁sound ▁experience ▁of ▁other ▁people ▁in ▁the ▁room ▁by ▁moving ▁the ▁mole cules ▁of ▁air . ▁Z aze ela ▁designed ▁two ▁light ▁sources ▁to ▁produce ▁the ▁frequencies ▁in ▁the ▁light ▁medium : ▁a ▁continuous ▁installation ▁of ▁floating ▁sculpt ures ▁and ▁color ▁sources , ▁and ▁a ▁series ▁of ▁sl ides ▁entitled ▁" Or n amental ▁Light year s ▁T rac ery ". ▁A ▁Dream ▁House ▁exists ▁at ▁the ▁M ela ▁Foundation ▁on ▁ 2 7 5