[quote=@Techspert]
<Snipped quote by whizzball1>

How do they work?
[/quote]

You can consider them kind of like another spatial dimension. They're an intrinsic aspect of everything in Existence. If you can move left and right and see a different perspective of a rubber duck, then you can move layer by layer and see even more different perspectives of the rubber duck. All the 3D perspectives visualise the same unchanged duck; same for layer perspectives. From one dimensional perspective, you can reach out and push the head of the duck, but from another perspective, you might only be able to touch the tail. From one layer's perspective you can reach out and squeeze the duck, but from another perspective, you can reach out and push the colour of its bill onto its body!