Mina Loy, Hourglass
“We have a definite but unknown quantity of experience at our disposal. As soon as the hourglass is turned, the sand will begin to run out and once it starts, it cannot stop until it’s all gone.”
Klepsydra (literally “water thief”) the Greek word for water clock, is any
timepiece in which time is measured by the regulated flow of liquid into (inflow type)
or out from (outflow type) a vessel where the amount is then measured.
Also, in ancient Greece, a device (water thief) for drawing liquids from vats too large to pour,
which utilized the principles of air pressure to transport the liquid from one container to another.