Zograscope

Zograscopes created an unprecedentedly realistic experience of depicted scenes, so much so that Blake (2003) described it as "virtual reality".

[5] A zograscope allowed viewers to move their eyes over very large scenes, yielding an immersive experience.

[9] But Chaldecott (1953) doubted this could have been the sole reason for the devices' enduring popularity, leaving the major factor to be the realistic appearance of the depicted images.

The image is magnified, perhaps giving it a visual angle similar to the real scene the picture is depicting.

As well, coloured parts of the image will be refracted differently for each eye, creating a version of chromostereopsis.

When this is placed over a computer monitor displaying a photograph of a natural scene, the depicted depth will be enhanced.