"Tunneling" starts off messy. It requires multiple images, each produced separately as a prototype and designed to both partially overlap another layer and also appear behind one. These are great fun and absorbing, like making up a world. There are watercolor paintings showing perspective, but then there's an actual foreground, one or more middle grounds and a background. This artform requires many skill sets like fabrication, lettering and using tiny cutting tools. My background as a bookbinder and model builder comes in handy here!
My home page shows a video depicting a right-to-left camera pan showcasing some of the visual drama in peeking THROUGH the layers. Below is a vertical pan: