立りっ体たい鏡きょう

noun

stereoscope

A device for viewing two slightly different images to create a three-dimensional effect. Technical term.

• 立りっ体たい鏡きょうで昔むかしの写しゃ真しんを見みると、風ふう景けいが立りっ体たい的てきに見みえる。

  When you look at old photos through a stereoscope, the scenery appears three-dimensional.