During the annual 3 weeks rainy season in Seoul, South Korea, the city’s energy and color disappear under the dark cloud and people would rather stay inside. The school of the Art Institue of Chicago teamed up with Pantone to bring some color back during those weeks. Using hydrochloric paint – a special formula that changes from transparent to opaque when it gets wet, they created some amazing art pieces which only can be seen when it has rained.