The open brain corals, Trachyphyllia geoffroyi, are just one of thousands of classifications of coral. They are named as such due to their resemblance to an inverted animal brain as seen by the human eye. As the name also suggests, the open brain corals are related to the many other species of brain corals found in shallow warm-water coral reefs in all the world's oceans. The different specific sub-species come in an array of colors ranging from opaque, blue, green, red, pink and brown.