An experiment

 

As you can see, in this experiment the water doesn't fall. The boy has tested water in two vessels to demostrate taht the water doesn't fall.
After that he tested a card on the glass and the water doesn't pass to the floor.
Then he put one of the vessels on the other and take away the card. The water resist in the two vessels, then the boy starts to put coins and we can see a space between two.