I present here a 3d-hanjie made up of 2 images that can be seen in relief in "freeviewing" - parallel.
For this you need to resolve the two hanjies and place them on the screen at a distance of about 5 cm (image from left to left, image from right to right). You need to select the "3d hanjies" series and adjust the zoom and the order of the images
more explanations:
https://fr.wikipedia.org/wiki/St%C3%A9r%C3%A9oscopie#Vision_libre
https://en.wikipedia.org/wiki/Stereoscopy#Freeviewing
and examples for eye training:
https://commons.wikimedia.org/wiki/Category:Parallel-view_stereo_images

Attention! It is tiring for the eyes the long effort to look at stereograms.