I'm following this tutorial where you create a popular illusion using images as planes.
Tutorial: https://www.youtube.com/watch?v=sk87jDzHGKA
However, I can't seem to get the object to receive shadow unlike other objects I've worked with before. It could be that the nodes I've used to get this result is a mix shader that uses the images of the back and front of the illusion with backfacing but I don't know how to get around this.