In interior decorating, the pig's actually quite there. It's used in paint for the texture, but also for the glossiness. In sandpaper, bone glue is actually the glue between the sand and the paper. And then in paintbrushes, hairs are used because, apparently, they're very suitable for making paintbrushes because of their hard-wearing nature.
Christien Meindertsma
Sand, Pig, Bone 