First, I think this sounds wonderful for your community. I’m a ceramist, so I think I can offer some advise. Ceramic is such a beautiful medium, and not enough people get to experience the process. I think you have a concept that will invariably connect people with their local environment through their participation.
As for your idea of casting tree bark with clay, this might be more difficult than you’d expect for a lot of reasons. But by all means try it out simply to experience working with clay. I’d suggest doing a plaster casting of the tree to create a mold, and then a clay slip casting of the plaster mold. This way you will end up with a positive replica of the bark rather than a negative impression. This method will also allow you to make multiple casts from the same mold.
Some things to consider:
- If the goal is to work with living trees, check with a local arborist to make sure you won’t be harming the trees. I’m not sure what plaster itself would do to a tree, but you’d probably need to screw/nail the mold frame to the tree to do the plaster casting. And taking the mold off might damage the bark too. I would test your process with recently felled trees.
- Slip casting can be really tricky. While I encourage you to experiment, you might want to reach out to local ceramists to help you. But once you get the process dialed in it’s actually pretty simple.
- Some trees might not work for this project. Clay slip will fill cavities in the plaster mold. When the clay dries it could be impossible to remove the casting without it breaking. You may end up having to fill cavities with more plaster. This will result in replicas that are not a 100% accurate.
- Check with a local community college or university for advice and kiln space. This type of project is something is often something they’re looking for.
- There are lots of clays you could use and lots of ways of finish each piece. So investigate what you want the final product to be like. Ask what colors are you looking for? What texture do you want the ceramic to have? Do you want to glaze them? Reduction fire them? Things like that.
Lots to consider, but this sounds like a lot of fun.