Very interesting idea to use sandpaper in mixed media. Never thought that such a rough surface could give such an expressive artistic effect. It's like a reminder that unconventional materials and approaches often open up something new. By the way, I recently looked through reviews of various local publications and came across a discussion of Parikiaki https://www.pissedconsumer.com/company/parikiaki/customer-service.html . It's always useful to see how even in the media, as in art, originality and attention to detail are valued.