Here is a Newton gravity sand timer that puts on a mesmerizing show as time passes by. It is an hourglass inside a sealed cylinder filled with liquid. When the timer is flipped upside down, the hourglass rises to the top of the column.
To Float or Not To Float
The kit consists of an acrylic tube and a sand timer. Just bring your own water and table salt, and you are set. Grand Illusions has shared the above video to show how this works.
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