Keywords
adult, beamer, color, communication, consumer electronics, differential focus, education, electronics, electrotechnology, female, focus, focus on background, from behind, further education, group of persons, horizontal, indoor, male, over the shoulder, part of, pedagogics, pedagogue, person, photograph, presentation, side by side, sitting, small group of people, teacher, 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, 524901