Keywords
artists chalk, blackboard, classroom, closeup, desk, differential focus, e=mc2, education, energy, equation, formula, geography, globe, image source, indoors, inflatable, knowledge, learning, lesson, nobody, orthographic text, physics, planet earth, school, still life, the americas, three objects, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, ie125-038, ie125 038, ie125038