It’s good to hear that there’s at least someone who cares about your welfare. I think you’re better off left in peace than the rest of the world. Things look less rosy here.
The idea is that the sand should just stick to the wall; I could cover the whole wall evenly with sand, then you’d just see little specks, but of course I can also make figures or a picture. The real difference is painting with sand, and I also saw a Chinese painter who had made two peacocks using only sand, but I think she simply used brown sand and then painted it.
Another option is plaster; I’ve got some of that left, so I’m going to see if it can be mixed with paint – perhaps just the powder, or make it plaster-like first and then add paint – though I don’t think I’ll get really bright colours that way.