Hold the glass out at arms length, and place a straw in your mouth. Now, as you suck through the straw, at the other end–the liquid visibly diminishes, even though it is three feet away. Or you can have an assistant hold the glass at one end of the stage, while you suck through the straw at the other end–and the liquid visibly diminishes. Or have a puppet or Vent doll “drink” the liquid!
Iinstructions give you many ideas for its use. The glass we supply “opens” for easy cleaning, and is an excellent utility or comedy prop at a very affordable price.