Clay play
Kneading, pushing, pulling, pounding, poking, shaping clay exercises our hands and our imaginations. Find some on the farm, dig it up and have your visitors make something to take home or to leave on the farm to decay slowly back into earth.
Debs Bull from Lower Smite Farm uses clay to model the pond beasties so all her vision impaired visitors can participate, using their sense of touch instead of sight.