We’re not sure whether to call this an Etch-a-Sketch upgrade or ... From the computer’s point of view it looks and acts like a normal mouse but this is so much more fun (and less productive).

presumably like how a modern optical computer mouse operates. Perhaps most intriguing are other drawings showing a single user two Joy-Cons in a mouse orientation at once and another drawing ...

[Mitxela] wanted to build a different kind of mouse, one that worked like an Etch-a-Sketch toy with one X knob and one Y knob. Armed with some rotary encoders and a microcontroller, that shouldn ...