You have before you – layers of concentric shells.
You are in the outermost and most recent shell.
The Outer Shell
This way lies the frozen remains of the Permanent Record.
Originally, actually, it was the instructions for a new rice maker that we had bought where the term 'Outer Shell' first caught my eye. The dire warning: 'Do not touch the Outer Shell while Amber Lights hold steady' seemed a little OTT but then I realized, the insinuation might be that I was to be burnt or electrocuted as part of the design so I stepped off. This isn't the actual document but it gives the basic flavor.Take the time to click on this exploded diagram, the super-fine translation is poetic.