Do overhead projector transparencies count as natural? They seem to be endemic in certain office biomes, though I suspect they may actually be an invasive spec

Do overhead projector transparencies count as natural? They seem to be endemic in certain office biomes, though I suspect they may actually be an invasive species throughout most of their range, and they're usually composed almost entirely of acetylated cellulose. Photographic film, too. https://en.m.wikipedia.org/wiki/Cellulose_acetate https://en.m.wikipedia.org/wiki/Cellulose_acetate