Just saw a nice example of manual particapation of interaction: Tune 'n Radios. The radio works only after your drilling holes for speaker, choosing a antenna and attaching something on the volume and tune switches for full holding, by which the radio is totally set and customized. It's an ultimate DIY designer craft and everthing is supposed from your own everyday objects.

So, what exactly do I get inspired here? I think my excitement is that the user can totally set his own control panel, which is not just simply personally customized but is to attach the user's memory, habit and memory onto the object. The designer should leave some free space for the user on purpose, which I call unfinished design, of course meaningfully not practically. At a resonable level, the more participation the user is asked to do, the more sense of interactivity this design would convey.
I've been thinking about what I can do with drawing. What is the key element that exists in drawing behavior which is so common experience that nobody can miss it? Could it be some individual event having little to do with drawing itself? Or could be an acident during drawing? Or an opposite phenomenon to drawing? Erasing? Oh, there are too many things going on here. I have to keep writing, drawing, typing and thnking to make the ideas come out continuously.