▁that ▁the ▁music ▁is ▁similar ▁to ▁David ▁B owie ' s ▁late ▁ 1 9 7 0 s ▁experimental ▁electronic ▁phase , ▁sing ling ▁out ▁" C ry stal ▁City " ▁" with ▁vocals ▁almost ▁identical ▁to ▁B owie ." ▁Hill age ' s ▁rec urr ing ▁science ▁fiction ▁influence ▁continues ▁to ▁be ▁felt ▁on ▁Green , ▁and ▁according ▁to ▁Pr ato , ▁this ▁is ▁especially ▁apparent ▁on ▁such ▁tracks ▁as ▁" Se a ▁Nature ," ▁" U FO ▁Over ▁Paris ," ▁and ▁" Un ident ified ▁( F lying ▁Being ). " ▁According ▁to ▁El ly ▁Roberts ▁of ▁All g igs , ▁Hill age ▁spent ▁ 1 9 7 8 ▁expl oring ▁many ▁sound sc apes ▁that ▁included ▁synth esis ers ▁and ▁rock ▁guitar , ▁and ▁was ▁best ▁exempl ified ▁by ▁the ▁Green ▁song ▁" E ther ▁Sh ips ". ▁ ▁Green ▁has ▁been ▁described ▁as ▁" partial ly ▁mixed " ▁due ▁to ▁the ▁seg ues ▁between ▁songs . ▁ ▁Green ▁was ▁significant ▁for ▁Hill age ▁as ▁he ▁began ▁to ▁experiment ▁with ▁early ▁guitar ▁synth es izers ▁for ▁the ▁first ▁time ; ▁he ▁had ▁acquired ▁a ▁Roland ▁GR ▁ 5 0 0 ▁guitar ▁synth es izer ▁which ▁he ▁uses ▁extens ively ▁on ▁the ▁album ; ▁" It ▁was ▁an ▁amaz ing ▁instrument ▁that ▁proved ▁to ▁be ▁okay ▁for ▁studio ▁work , ▁but ▁was ▁too ▁complicated ▁to ▁use ▁on ▁stage ." ▁Most ▁of ▁the ▁guitar ▁and ▁some ▁of ▁the ▁keyboard ▁sounds ▁on ▁Green ▁were ▁achieved ▁using ▁the ▁GR ▁ 5 0 0 ,