Acadia National Park is made up of some of the hardest rocks on earth. Most of it is granite; you can see it along the coast, being pounded by ocean surf. You find huge granite boulders lining many of the ponds and lakes. And you can find it in abundance on top of Cadillac Mountain, Acadia's tallest peak, stained with lichen.
I made this image on my first visit to Acadia, in October 2006. To me, it's always looked like a giant brain with its folds, pink coloring and segmented parts. I included my feet in the image to give it some scale.