Die shots of as many CPUs and other interesting chips as possible

How can someone explain this to a kid? Is there somewhere an even more simplified version than Arduino or similar to show how all these things actually work? I know arduino is not a cpu, but overall, how these things work together, would be great to see/show.

I don't expect to show how electrons move :) I mean, some model, a toy or so, that shows how these things work. I remember it only from books/specs, but even there, at a certain point there are "limits" :)

I‘m teaching a course on computer architecture at my university and there are these model processors called MUx (MU0-7) that explain how a CPU works from the ground up. I‘m not aware of any toys (my students keep asking me about that as well), but I wrote an interactive visualizer that illustrates the simplest processor and how data moves through it: https://pascalbormann.de/mu-vis/ Not mobile friendly unfortunately and maybe a bit too advanced for kids, but it could be a starting point. The code is here if you want to build on it: https://github.com/Mortano/mu0-visualization