What have you done to your keyboard?! Hands Down Promethium on a MacBook

There were a few stickers on the lid, but <i> why </i> does my laptop look like this now? In short, I'm learning to touchtype a non-qwerty layout. My Japanese MacBook keyboard has 34 stickers for a custom layout I've been using a UK layout Microsoft Natural Ergonomic Keyboard 4000 for twenty years now. I wrote my PhD thesis on one (using the LaTeX typesetting language), and got a second matching one when I started working as a Post Doc.