In almost all of the course on interactivity that I have taught, someone comes up with the idea of making a screen-based Etch-A-Sketch toy. They’re almost always rubbish because it lacks the physicality of the Etch-A-Sketch and the charm of that.
All of which is a thinly veiled excuse to talk about George Vlosich III’s Etched In Time artworks that really take Etch-A-Sketch drawings to a new level. I find it impossibly hard to even draw a curve with an Etch-A-Sketch, let alone shading. Check out him in action on YouTube or his Etched In Time website