Ключевые слова: abstract, angle, area, art, background, base, basic, black, circles, concept, design, detail, drawing, edge, education, element, engraving, faces, figure, form, geometric, geometric shapes, geometry, graphic, height, illustration, isolated, line, lines, machine parts, math, mathematics, object, on paper, pencil, prism, science, shape, sign, sketch, solid, students, study, symbol, vintage, volume,