We all know the trick of holding water in a drinking straw by holding your thumb over the top creating a vacuum I know its also to do with air pressure below. I managed this on a bigger scale using a 2inch pipe, a water pump and a valve i could close at the top of the pipe to replicate the thumb. Now im wondering if this could be achieved on a grand scale ? I would love to create a water feature in my home a 6 or 10 foot wide pipe cut short in the ceiling filled with water that people could walk under, touch or even take a glass of water from! Is this possiblle before i turn my house into one giant puddle ?