Even if you aren't able to see the art while creating it you would still know a little of what's happening on the canvas. It would be farther removed for sure,

Even if you aren't able to see the art while creating it you would still know a little of what's happening on the canvas. It would be farther removed for sure, but even the physicality of the scraping here would start to tell you what is happening. I like the idea though, and it does take the artist a little further away.