Ключевые слова: 2021, abstract, activity, background, celebration, christmas, colorful, concept, contest, curve, drone, empty, event, exercise, field, future, grass, green, health, lane, line, modern, new, new year, nobody, number, outdoor, pattern, playground, race, racetrack, red, rubber, run, running, school, sport, sprint, stadium, start, striped, surface, texture, textured, top, track, view, way, year,