What then is time?
time is a measure
time is what keeps everything from happening at once
time is part of the fundamental structure of the universe
time is not any kind of container
time is neither an event nor a thing,
time flows and can be measured.
time is a judgment
time is the motion of the sun across the sky,
the phases of the moon,
the swing of a pendulum,
and the beat of a heart.
time is radiation emitted by cesium atoms
time is money
time is each day and each human life span
time is the clock
time is a central reference point.
time is faulty
time is the shadow cast
time is an integrated circuit
time is the basis for modern civilization
time has been defined with exact numbers
time is offset
time is a measurement relative to a distant star
time is limited by two instants
time is a wheel repeating between birth and extinction.
time is linear
time is the right moment
time is an old, wise man with a long, gray beard
time is a paradox and an illusion.
Both the future and the past are simultaneously present.
time has no value;
time itself ceased
time does not exist