Ключевые слова: chronology, chronometry, countdown, deadline, falling sand, flow, glass, history, hour, hourglass, instrument, measure, measurement, metaphor, minute, overtime, passing, past, sand, sand falls, sand glass, sand pours, sand trickle, sandglass, sandglasses, science, symbol, time, time concept, time falls, time glass, time out, timeglass, timer, timing, timing hourglass, timing sandglasses, trickle, wasting time,