I'd like to create a parallax occlusion effect (cycles or eevee) where a cube or plane appears to contain another universe inside of it. I've seen a lot of brilliant solutions that can fake it using 2D images, but I'm wondering if there is a solution that would allow for objects within the plane to actual "pop out", like below --
These solutions all work well for 2D planes, and I know a lot of people use this to create fake rooms inside buildings, but again you're stuck using flat images that can't cross the border of the plane. I also think anything to with compositing nodes would make the effect I'm going for impossible.