Penguins made of ice were placed in a park in Brazil so as to educate the public through art the perils of global warming!

I found this at art installation at NotCot.org who found it originally at 50Graus.org.

When learning a specialized craft or something new most people "learn with their hands." For those nebulous concepts like Einstein's relativity principles, or global warming, it usually takes a good metaphor and boy does this metaphor work. There is one image at the 50 Graus site of a woman petting a melting penguin. For any artist or educator that is a home run.