A day (24 hours) can be divided into 3 sets of 8 hours, which could measure our daily life, work, entertainment and sleeping time in normal. The setting time of "Countdown" timer is 8 hours, counting down the time within last 8 hours, from hours, minutes, seconds to 1/10 seconds progressively. The fast beating figures directly make viewers feel the passage of time. Moreover, it declared that the life time we experienced has become the past when the installation rang.

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