One of my ideas was to hack a stethoscope to make it a tool to listen to the nature. I made some research around this topic in a previous post.
What does a tree sound like ? A leaf ? A flower ? By making people listen to nature for real, it could help to encourage to reflect on our relation with the planet. Making remember that it is our host, it makes us be alive and that we have a duty to behave for the good of it and not to destroy it like we do nowadays.