Ключевые слова: 3d, advertisement, arithmetic, background, backgrounds, blank, book, bookcase, books, bookshelf, boy, business, businesswoman, child, childhood, color, colored, colour chart, colour sample, colour swatch, composite image, computer, computer graphic, concentration, copy space, corporate, cute, desk, development, device, digital, digital composite, digital generated image, digitally generated, education, educational, elementary, elementary school, empty, executive, focused, friendly, full frame, graphic, gray background, green, hispanic, holding, illustration, information, intelligence, isolated, jumble, knowledge, laptop, learn, learning, library, literature, male, math, modern, notebook, number, reading, research, school, shelf, student, study, studying, textbook, textbooks, vignette, wallpaper, white color,