Secret messages are present in the receipts you hold in your wallet right now. The codes, however, can't be cracked. Infrared is a light wave past the visible spectrum, just after red, invisible to the human eye. In 1800, physicist and astronomer Sir William Herschel accidentally discovered infrared while conducting experiments with a prism and a thermometer. Hands describing, constructing, arranging. Spontaneous creations, untranslatable texts. These hands see what is... see more