A box in a box in a box

In honor of yesterday's 9½-page writing session on Project X including a "box in a box in a box" moment, I thought I might spare a while to share a glimpse into The Process™ and explain what a box in a box in a box is. Big spoilers for The Supernatural Enhancements follow. (And by the way, Project X is not the same as the DIP, and yes, I expect that people keep track of all the different secret projects I only hint at in the most annoying, cryptic fashion).

I don't have any copies of TSE but I ...