Ключевые слова: 20, 2017, 2018, 2019, 20th, appointment, background, birthday, blue, business, calendar, concept, conceptual, corporate, cubes, daily, date, day, deadline, december, design, diary, empty space, event, feb, february, idea, important, message, month, monthly, note, notice, number, organize, organizer, planner, remember, remind, reminder, selfeducation, sign, symbol, time, twentieth, twenty, white, winter, wooden, workplace,