Vintage Japanese Stereoviews...
[caption id="attachment_27338" align="aligncenter"... ...1929). These particular photos were taken for a stereoscope (kinda like a View-Master) that made them look li... ...at appear three-dimensional when viewed through a stereoscope , because each eye sees a slightly different image...
https://www.neatorama.com/2009/11/06/vintage-japanese-stereoviews/
