Liquid timers are sensory shapes which use the flow of oil and water droplets to show the passage of time, in a colourful and calming way. Turn upside down and ...

Cut water bottles down to five inches each. If your bottles are bigger than five inches, you can cut them down to size with your scissors or knife. ... ...

In its usual form it consists of two cone-shaped or oval glass receptacles joined by a narrow neck. Sand or a liquid (such as water or mercury) in the ...