Writing in the dust is a fantastic image and a vivid metaphor. Jesus wrote in the dust when the pharisees tried to trap him forcing him to condemn or equivocate when they brought before him a woman 'caught in adultery'. Jesus didn't shoot first and ask questions later, he bent down and started writing.
Using your finger to try and bring meaning out of a mound of tiny fragments. Wanting to leave a mark while all the time being aware it could just blow away... The Bogle band and friends will use poetry, story and song to explore this metaphor, and many more besides.