Invisible

Braille text on the wall:

On our planet are substances we exploit to great benefit and unforeseen consequences. I have chosen nine to consider: blood (aids research, ethnic cleansing); salt (chemicals, oceans); gold (currency, mining); air (flight, environmental degradation); soil (food, contamination); DNA (genetics, overpopulation); corn (food, bio-fuels); oil (energy, fertilizer); and water (manufacturing, supply). Commodities, resources, and ideas move easily and rapidly across national boundaries. Will we evolve the social intelligence to better balance our technological intelligence?  Can we continue exploiting resources without dire ramifications? Our deep history as makers on the planet is one we honor; what are we choosing to be making today?