Stock photography, photos: Thinking person Stock photos of A person poses in deep thought on a rock outcropping during a pause in a hike in Acadia National Park. Photograph: © Dan Creighton Click for a larger image and more information Keywords associated with this stock photo: human being, human, gesture, people, dusk, dawn, body, nightfall, environment, United States of America, hiking, USA, North America, hike, hiking, action motion, outdoor recreation, world regions & countries, early, evening, late, night, twilight, TIME OF DAY, sky, skies, CATEGORIES, thoughts, habitat, thinking, conceptual, concepts, concept, solemn, ecosystem, US, recreation, alone, decision, solitary, aloneness, decide, sports & recreation, brainstorming, decisions, humans, America, park, national park, land, Acadia National Park, persons, activities, Maine, human beings, ecology, natural world, nature, environmentalism, thought, scenery, ACTIVITIES/ACTION, gestures, blue, contemplate, think, activity, person, standing, gesturing